Abstract: Embodiments of the invention include luminaires with a large-scale prism. In some embodiments, a large-scale prism can be any prism with a base having the smallest dimension greater than one half of an inch. In some embodiments, a large-scale prism can be any prism with a base having the smallest dimension between two and four inches. At these large-scales, the geometry of the individual prism can be easily appreciated through casual observation. Use of large-scale prisms can provide a light without high angle glare.

Abstract: A method for providing an optical element may include providing an optical feature in the optical element that spreads or distributes light passing through the optical element. The method may also include providing a texturing in at least a portion of the optical feature of the optical element.

Abstract: A wave-length conversion inorganic member can includes a base body and an inorganic particle layer on the base body. The inorganic particle layer can include particles of an inorganic wave-length conversion substance which is configured to absorb light of a first wave-length and to emit light of a second wave-length different from the first wave-length. The inorganic particle layer can include an agglomerate of a plurality of the particles. Each of the plurality of the particles are in contact with at least one of the other particles or the base body. A cover layer comprises an inorganic material, and the cover layer continuously covers a surface of the base body and surfaces of the particles. The inorganic particle layer has an interstice enclosed by the particles, or by the particles and one of the base body and the cover layer.

Abstract: A light fixture for an induction-based light source is described. The light fixture comprises a top cover; a lower cover coupled with the top cover; a lens coupled with the lower cover; a reflector positioned behind the lens; and an induction-based light source positioned between the lens and the reflector, wherein the reflector is configured in relation to the induction-based light source.

Abstract: A light reflector of which the bidirectional reflectance R1 is from 90 to 120% when the light entrance angle is 15° and the light acceptance angle is 0°, and the bidirectional reflectance R2 is from 85 to 110% when the light entrance angle is 75° and the light acceptance angle is 0°. The light reflector has high reflectivity, and attains brightness improvement even in underlight-type backlights.

Abstract: A substrate for carrying light emitting diodes and a manufacturing method thereof are provided. The substrate includes a bottom portion, a side portion and a reflective element. The side portion is disposed on the bottom portion. An upper surface of the bottom portion and an inner surface of the side portion define a recess where the light emitting diodes and the reflective element are disposed. More specifically, the light emitting diodes are disposed on the upper surface, while the reflective element is disposed along the inner surface of the recess. With the above-mentioned arrangements, the light extraction efficiency of the light emitting diodes can be increased.

Abstract: A bulb-shaped LED lamp includes a plurality of high-intensity LED modules 2 where a high-intensity LED is attached on an LED fixing base plate, a heat sink 5 where the high-intensity LED modules 2 are attached on an end face in an axial direction thereof along a circumferential direction, for performing radiation of the high-intensity LED modules 2, a reflector 4 which is provided so as to surround the plurality of high-intensity LED modules 2, for guiding light from the high-intensity LED modules 2 forward, an electronic circuit for driving 6 which drives the high-intensity LED modules 2, a housing 7 which houses the heat sink 5, the electronic circuit for driving 6, and a portion of the reflector 4 therein, and a globe 8 which configures an outer shell together with the housing 7.

Abstract: A first lighting device comprises at least one plural cavity element and a plurality of solid state light emitters. A second lighting device comprises at least one plural cavity element, a plurality of solid state light emitters and at least one encapsulant region, at least a portion of the plural cavity element being surrounded by the encapsulant region. Each plural cavity element has at least two optical cavities. Each optical cavity comprises a concave region in the plural cavity element. At least one solid state light emitter is present in each of at least two of the optical cavities.

Abstract: An illumination device, comprising a basic body (1) having a cutout (5), a reflector (51), which is formed at least by parts of the cutout (5), and at least one optoelectronic semiconductor component (20) arranged in the cutout (5), wherein the semiconductor component (20) has an optical element (3) designed for directing at least part of the electromagnetic radiation emitted by the semiconductor component (20) during operation onto the reflector (51), wherein a radiation exit area (61) of the illumination device is at least twice as large as the sum of the radiation exit areas (44) of the semiconductor components.

Abstract: A diffuse light reflector is disclosed for use in lighting fixtures including luminaires, light boxes, displays, signage, daylighting applications, and the like. The reflector includes a light reflective nonwoven, a polymer layer that enhances reflectivity, and an opaque blackout layer. The reflector can be laminated to coil steel or aluminum and can be formed in metal coil or sheet forming operations. The polymer layer can be easily cleaned of machine oils from the metal forming operations.

Abstract: Lamps and bulbs are disclosed generally comprising different combinations and arrangements of a light source, a reflective optical element, and a separate diffusing layer. This arrangement allows for the fabrication of lamps and bulbs that are efficient, reliable and cost effective and can provide an essentially omni-directional emission pattern, even with a light source comprised of an arrangement of LEDs. The lamps according to the present invention can also comprise thermal management features that provide for efficient dissipation of heat from the LEDs, which in turn allows the LEDs to operate at lower temperatures. The lamps can also comprise optical elements to help change the emission pattern from the generally directional pattern of the LEDs to a more omni-directional pattern.

Abstract: A light housing is provided. Housing comprises plate with light communication for LED luminaire attached to upper surface of plate, annular base having a rim, plurality of supports connecting plate to annular base, slots in each of plurality of supports; and retention clips engaged within slots. Housing includes j-box rotatably secured by support to plate with mounting brackets which include locking detents to maintain support in upper or lower positions. Also provided is fixture assembly comprising housing with LED light attached thereto. Further methods for installing assembly are provided and include positioning assembly through hole in ceiling substantially within above-ceiling space, locking retention clips against plurality of supports to maintain assembly in position relative to ceiling; and engaging upper rim of reflector with deflection clips attached to bottom surface of plate of assembly.

Abstract: The present invention relates to an optical member, comprising: a light incidence surface; and a light-emitting surface which comprises a patterned portion intended for adjusting the intensity of light and formed at an area corresponding to a light source, and an adhesive portion disposed in an area other than the patterned portion. When the optical member of the present invention is applied to a backlight unit, the patterned portion, which diffuses the light from the light source, is formed in the area corresponding to the light source so as to effectively diffuse the light from the light source into the peripheral area.

Abstract: An LED illumination device includes a polygonal reflector and a plurality of LEDs received in the reflector. The reflector includes multiple sidewalls connecting with each other. Each LED is located adjacent to at least one corresponding neighboring sidewall. The polygonal reflector can have a shape of a square, a rectangle, an octagon etc. Light generated by the LEDs has at least a part reflected by the reflector to radiate out of the LED illumination device upwardly. The LED is a top view LED. A top of an LED die of the LED is no higher than a bottom of the sidewalls of the reflector.

Abstract: The present invention provides various embodiments for apparatuses, systems, and methods for lighting devices used in shelving, displays, and the like. Some embodiments provide lighting device comprising elongated extrusions with a first surface and a second surface proximate the first surface. The second surface may be reflective. One or more light emitting devices may be mounted at the first surface of the extrusion. The first surface is angled with respect to the second surface such that at least a portion of the light emitted from the light emitting devices reaches the second surface. If the second surface is reflective, at least a portion of the emitted light will be reflected from the second surface. A protective and possibly light diffusive lens may be provided between the first and second surfaces. In other embodiments, lighting systems may be provided with a plurality of lighting devices as described above.

Abstract: An LED lamp set for enhancing illumination and eliminating ghost images includes a lamp shade, a diffusion membrane and a circuit board. The lamp shade has a plurality of light cups each having a housing chamber to hold at least one LED. The housing chamber has an aperture at the bottom run through by the LED to form electric connection with the circuit board and an opening remote from the aperture to define a light output surface. The diffusion membrane covers the light output surface and is made of a transparent material and includes a plurality of transparent bumps on the surface. The circuit board is located below the lamp shade. Through the concave shape of the light cups and repetitive reflection of the bumps, light can be condensed to avoid scattering and loss. Moreover, as the light is greatly and uniformly condensed, ghost images can be eliminated.

Abstract: Multiple-tier omnidirectional solid-state emission source capable of dispersing light in flexible distributions or custom-intensity distributions which throw more light forward, to the side alternatively, or in all directions. This optical light control requires multiple-surface manipulation of the directions of the light energy bundles emerging from solid-state light sources. Producing uniform light up to 325 degrees in the vertical direction through the combined implementation of multi-stage light guiding for remote source elongation and multiple-tiers of TIR, refraction, and scatter for remote source emission and control. Combining the efficient light production of an LED chip with that of a directly coupled optic results in high efficiency custom distribution to direct light where required.

Abstract: The invention provides systems and methods for providing illumination. A lighting unit may have a support structure, and one or more light emitting elements supported by a circuit board contacting the support structure. A first optical element and a second optical element may be provided. A remote luminescent material may be provided on one or more optical elements. Light emitting elements configured to excite the luminescent material such as highly efficient light emitting diodes may be directed towards the luminescent material. The support structure may be a heat dissipating element, which may conduct heat from a heat source to a surface of the support structure. The heat dissipating element may have a passageway permitting the formation of a convection path to dissipate heat from the support structure. Such lighting units may be used to replace conventional fluorescent light tubes or other lighting devices, or may be provided as standalone lighting units.

Abstract: An apparatus for an illuminated electrical enclosure lid is provided. The lid has a lid body comprising a front face, a rear face, and at least one translucent edge. The translucent edge projects rearward from the rear face and is configured to be fit onto an electrical enclosure. The lid also has a reflective surface coincident with the rear face. The reflective surface reflects light back into the electrical enclosure. The translucent edge is configured to direct light from the illuminated electrical enclosure lid at a plurality of angles.

Abstract: The present invention provides a reflector plate and a backlight system. The backlight system includes a reflector plate and a back frame and the back frame carries the reflector plate. The back frame includes at least two primary assembling pieces, the at least two primary assembling pieces being joined to form a main frame structure of the back frame; and the reflector plate has a bottom to which a metal net is mounted for preventing electromagnetic interference. With the above arrangement, the backlight system of the present invention has a back frame having a simple structure, saving material for the back frame, and reducing the cost of the back frame.

Abstract: A light fixture with a textured reflector surface is disclosed. Embodiments of the present invention provide for a lighting system in which LEDs face, and the majority of light form the LED light source is incident on, a textured surface of a back reflector while producing minimal glare and minimal imaging of the light source. Such a reflector may be referred to as a retro-reflector. The reflector for the light fixture can be made from a relatively inexpensive material such as polycarbonate, which without texturing has a specular or semi-specular surface. This material can be used alone or with a metal substrate to form the reflector. The textured surface can be textured by way of an imprinted pattern or by roughening, and can be extruded. A prismatic texture may be used. The texturing can also be spatially varied.

Abstract: A light fixture with a textured reflector is disclosed. Embodiments of the present invention provide for a lighting system in which LEDs face, and the majority of light form the LED light source is incident on, a textured back reflector while producing minimal glare and minimal imaging of the light source. Such a reflector may be referred to as a retro-reflector. The reflector for the light fixture can be made from a relatively inexpensive material such as polycarbonate, which without texturing has a specular or semi-specular surface. Further, a diffuse white layer to provide color mixing or prevent glare and reflections is not needed. The textured reflector can be textured by way of an imprinted pattern or by roughening, and can be extruded. A prismatic texture may be used. The texturing can also be spatially varied.

Abstract: A luminaire includes an LED based illumination device with a light emitting area and an optical element that is configured to produce a hybrid emission pattern with a spot beam emitted within a predetermined far field angle and a background level spherical emission pattern. The optical element, for example, may be configured with an input port and an output port, and a perimeter that increases in size from the input port to a maximum perimeter and decreases from the maximum perimeter to the output port. The optical element receives an amount of light from the LED based illumination device at the input port, emits a first portion of the light from a curved, semitransparent sidewall, and emits a second portion of the light at the output port, wherein the emission area of the output port is less than a maximum perimeter of the optical element.

Abstract: An LED based illumination module includes a thermal interface surface that is coupled to a thermal interface surface of a reflector using engaging members that generate a compressive force between the thermal interface surfaces. The engaging members may be, e.g., protrusions that interface with recesses, spring pins, formed sheet metal, magnets, mounting collar, etc. The reflector may include a vented portion that is not optically coupled to the LED based illumination module to allow air to pass through the reflector.

Abstract: Disclosed herein is a resin composition including 100 parts by weight of an organic resin and 50 to 1,000 parts by weight of an inorganic filler, wherein 10 to 100% of the inorganic filler is composed of an oxide of a rare earth element.

Abstract: The present invention provides a reflector plate and a backlight system using the reflector plate. The backlight system includes a reflector plate and a back frame that carries the reflector plate, wherein the back frame includes at least two primary assembling pieces, the at least two primary assembling pieces being joined to form a main frame structure of the back frame; and the reflector plate comprises a substrate layer and a reflection layer formed on the substrate layer, wherein the substrate layer is of a corrugated configuration, a wavy configuration, or a square wave configuration.

Abstract: The present invention provides a reflector plate and a backlight system using the reflector plate. The backlight system includes a reflector plate and a back frame that carries the reflector plate, wherein the back frame includes at least two primary assembling pieces, the at least two primary assembling pieces being joined to form a main frame structure of the back frame; and the reflector plate includes a foamed plastic substrate layer and a reflection layer formed on the foamed plastic substrate layer. With the above arrangement, the present invention provides a reflector plate that has a substrate layer made of foamed plastics in order to increase the stiffness of the reflector plate, reduce the risk that the reflector plate gets easily collapsing after the assembling of the backlight system, and thereby improve the performance of the backlight system.

Abstract: The present invention provides a reflector plate and a backlight system. The backlight system includes a reflector plate and a back frame and the back frame carries the reflector plate. The back frame includes at least two primary assembling pieces, the at least two primary assembling pieces being joined to form a main frame structure of the back frame; and the reflector plate has a substrate containing a conductive fiber net for preventing electromagnetic interference. With the above arrangement, the backlight system of the present invention has a back frame having a simple structure, saving material for the back frame, and reducing the cost of the back frame.

Abstract: The present invention provides a reflector plate and a backlight system. The backlight system includes a reflector plate and a back frame and the back frame carries the reflector plate. The back frame includes at least two primary assembling pieces, the at least two primary assembling pieces being joined to form a main frame structure of the back frame; and the reflector plate has a bottom to which a metal net is mounted for preventing electromagnetic interference. With the above arrangement, the backlight system of the present invention has a back frame having a simple structure, saving material for the back frame, and reducing the cost of the back frame.

Abstract: Disclosed is a luminous flux control member (3) comprising: a lid section (8) positioned, via an air layer, over one or two or more light-emitting elements (2) positioned on top of a substrate (4), and formed so as to intersect with the optical axis of the light-emitting elements (2); and side wall sections (6) that extend from the outer edge of the lid section (8) towards the substrate (4) side. The inner surface (10) of the lid section (8) is a concave surface with the center section thereof positioned closer to the light-emitting elements (2) than the outer peripheral section, and is covered by a transparent reflective film (13). The transparent reflective film (13) reflects some of the light from the light-emitting elements (2) towards the side wall sections (6) and allows the remaining light from the light-emitting elements (2) to pass through.

Abstract: The present invention provides a composition comprising a liquid crystal polyester, a white pigment and a glass fiber bundle obtained by bundling glass fibers using a sizing agent comprising a polyurethane having a polyester polyol unit and at least one of an aliphatic diisocyanate unit or an alicyclic diisocyanate unit, wherein the polyester polyol unit is a polyol unit having an aliphatic polyhydric alcohol unit and at least one of an aliphatic polybasic acid unit or an alicyclic polybasic acid unit. The liquid crystal polyester composition can provide a reflective plate having a high reflectivity.

Abstract: The present invention provides a reflector cup for a lamp, including a cup body, a cup top having an aperture through which a light source is inserted into the reflector cup, and a cup bottom provided with an opening for outputting lights from the light source. The cup body is provided with a plurality of recesses or protrusions that have a curvature different from that of a surface profile of the reflector cup. In one preferred embodiment, the cup body is provided with a plurality of grid veins arranged in a matrix, in each of the grid veins is formed a protruded or recessed curved surface. The curved surface may be spherical, cylindrical, conical or the like. The invention also provides a LED reflector lamp comprising the reflector cup.

Abstract: A light integrator having four parallelepipedal glass plates which have an identical width. Each plate has an inner side and an outer side with a length, as well as a first and a second longitudinal side and two end faces with a height, the plates are arranged relative to one another such that they enclose a parallelepipedal open cavity extending over the length, the glass plates being bonded to one another. The inner sides of the plates are subdivided into, in each case, a mirror-coated, optically active surface and an adhesive surface, and the inner side bearing with its adhesive surface of in each case one glass plate indirectly via adhesive against the first longitudinal side of another glass plate. The inner side of said glass plates have a groove running in a longitudinal direction and acting as an adhesive trap adjoining the optically active surface.

Abstract: According to an embodiment, a polyhedron may be provided. The polyhedron may include a first luminescent face; and a second luminescent face.

Abstract: A lighting device includes a housing, and a light-emitting module mounted in an accommodation chamber inside the housing and carrying a set of light-emitting devices on a circuit board thereof for emitting light, a plurality of refracting prisms for refracting a part of the light emitted by the light-emitting devices horizontally toward two opposing sides through the light transmissive peripheral wall of the top cover shell of the housing and two opposing double-beveled reflectors for reflecting the other part of the light emitted by the light-emitting devices toward the outside through the light transmissive peripheral wall of the top cover shell of the housing in the same opposing directions. Thus, the invention extends the luminous range of the light-emitting devices, enhances the luminance and reduces light loss.

Abstract: A specular reflector and LED lamps using embodiments of the reflector are disclosed. Embodiments of the invention provide a reflector for solid state lamps. The reflector can be a specular reflector. The reflector includes a rigid, polymeric substrate and sputtered metal applied to the substrate. In some embodiments, the metal is silver. In some embodiments, the metal is applied without an intervening base coat. In some embodiments, the substrate is made from or includes an aromatic polyester such as polyarylate. The reflector can include a discontinuous or irregular surface yet still exhibit very high overall reflectivity and efficiency because the metal can be applied without an intervening base coat. In some embodiments, the reflector is used in lamps having a retroreflective optical design.

Abstract: A fluorescent light emission enhancer light-cone for insertion into the central aperture of the fluorescent light bulb and subsequent expansion into a cone which helps increases the light intensity of the fluorescent light bulb by emitting outside almost half of light emission from the fluorescent light bulb that is lost inside between its loped tubes.

Abstract: Disclosed are a display device and a front cover thereof. The display device includes a display module to form an image, a front cover to cover a rim of a front surface of the display module, a keypad display provided at the front cover, at least one light emitting unit to emit light to the keypad display disposed between the display module and the front cover, and at least one light guide channel provided at the keypad display, the light guide channel having a cross-sectional area decreasing away from the light emitting unit.

Abstract: A reflector assembly for a lighting apparatus, the reflector assembly comprising two or more reflector modules configured for associating with one or more light sources, each reflector module comprising one or more reflectors for being located adjacent to alight source when the reflector module is associated with the one or more light sources, the one or more reflectors configured to reflect light from the adjacent light source. The reflector modules may further comprising a cover plate defining a plurality of light source apertures for allowing a light source to protrude through the cover plate, at least a first of the one or more light source apertures disposed adjacent to an overhead reflector and at least a second of the one or more light source apertures disposed adjacent to a lateral reflector. The reflector assembly can comprising any number of reflector modules and the reflector modules can be arranged in different configurations to create different light distributions with the same reflector modules.

Abstract: A lamp with wide-angle light emission including a housing, a light emitting module and a bulb is disclosed. The housing has a coupling portion and an electrical connector formed at two ends thereof. The light emitting module is arranged at the coupling portion of the housing. The bulb covers the light emitting module and comprises a center part and a border part, with the center part axially aligning with the light emitting module and the border part surrounding the center part. Furthermore, a diffusing reflector is arranged on the center part and the border part is formed by a light transmitting portion.

Abstract: Light directing film is disclosed. The light directing film includes a first structured major surface and an opposing second major surface. The first structured major surface includes a plurality of unitary discrete structures. Each unitary discrete structure includes a light directing portion that is primarily for directing light and includes a plurality of first side facets. Each first side facet makes an angle with the plane of the light directing film in a range from about 35 degrees to about 55 degrees. Each light directing portion also includes a first base that is defined by the plurality of first side facets and has a first minimum dimension. Each light directing portion also has a first maximum height. Each unitary discrete structure also includes a bonding portion that is primarily for bonding the light directing film to a surface. The bonding portion is disposed on and between the plurality of first side facets and includes a plurality of second side facets.

Abstract: A light fixture with co-formed plenum component is disclosed. Embodiments of the invention provide troffer-style recessed solid state fixture using a highly reflective plastic reflector. In at least some embodiments, the plastic reflector can meet the additional requirements placed on mechanical components exposed to the space above the ceiling plane in plenum return ceiling applications. Example embodiments include a light fixture with an LED light source and a reflector that is coextruded from a plenum rated substrate and a reflective material, for example, a plenum rated plastic substrate and a diffuse, white reflective material. In some embodiments, the plenum rated substrate includes polyetherimide, a polyphenylene ether/polystyrene blend, polycarbonate, polycarbonate copolymer, or a combination of the foregoing.

Abstract: An optical system for shaping a laser beam is disclosed. The system includes a first optical element that has a lateral surface which is designed as a reflecting surface for the laser beam, where the lateral surface reshapes the laser beam at least in some segments thereof into a ring-shaped laser beam. The at least segmentally ring-shaped laser beam propagates in a propagation plane. A further optical element is provided for shaping the ring-shaped laser beam that shapes the ring-shaped laser beam at least in some segments thereof in a plane parallel to the propagation plane of the laser beam.

Abstract: In various embodiments, a lamp may include at least one light source; and at least one reflector means for reflecting light that has been emitted by the at least one light source, it being possible for the at least one reflector means to have a radial asymmetric form about a longitudinal axis of the lamp.

Abstract: An LED base plate enabling the LED to emit high luminance white light. The base plate has a reflective surface, and protrusions disposed on the reflective surface have top portions formed with curved surfaces. The protrusions have bottom widths of 2 to 4 micrometers and heights of 1.2 to 1.8 micrometers, with adjacent protrusions having spaces of 0.6 to 3 micrometers. An InGaN epitaxy layer is coated on the reflective surface of the base plate and emits ultraviolet of wavelength in the range of 380 to 410 nanometer when the InGaN epitaxy layer is electrified. Ultraviolet light reflected by the reflective surface of the base plate and the protrusions stimulates and mixes fluorescent compounds of zinc oxide and yttrium aluminum garnet to generate complementary light of ultraviolet light. High luminance white light scatteringly emitted is used for illumination.

Abstract: An improved heat sink for a lighting fixture includes an inner heat sink conductively coupled to a lighting subassembly, a plurality of cooling fins conductively coupled to and extending away from the inner heat sink, and an outer heat sink coupled to the cooling fins and offset from the inner heat sink. The outer heat sink includes a lower heat sink coupled to a first set of cooling fins mounted on the inner heat sink, and an upper heat sink coupled to a second set of cooling fins. A plurality of air vents extend through the outer heat sink and are aligned with a corresponding plurality of the first set of cooling fins.

Abstract: A corrugated aluminum foil board has one or more sheets of aluminum foil corrugated, ridged, or bent in a wave-like or folded pattern to achieve increased rigidity, and sandwiched between aluminum foil sheets to form a strong and rigid material composition resembling metallic cardboard. The shaped sheets may be assembled by using a non-flammable glue, or by welding or otherwise fastened or fused, to create a generally rigid, lightweight, and fire resistant material with many advantages for the entertainment industry with respect to motion picture or television lighting, and other uses.

Abstract: A light guide plate 1 according to an embodiment of the present invention is a light guide plate in which light reflective dot are formed on at least one surface S2 of a light guide substrate 11, wherein the plurality of light reflective dot 12 are formed on grid points for printing targets, the grid points being regularly arrayed in a two-dimensional pattern, in each of individual regions obtained by dividing the at least one surface S2 of the light guide substrate 11 into the plurality of regions, and wherein some of the light reflective dot 12 are eliminated in each of the individual regions.

Abstract: A reflector is rotatably coupled to a light emitting diode (LED) module assembly. The reflector includes multiple alignment features that correspond with multiple notches provided in a reflector attachment coupled to a LED light source. The reflector can be made of a non-conductive substrate material, such as glass, and can have a non-conductive, reflective coating deposited on the inner surface of the reflector to allow the reflector to be more closely positioned to the LED light source. Reflector attachments can help to maintain precise reflector position during coupling with the LED light source. Media holders can be removably coupled to the light emitting portion of the reflector and provide for the quick mounting and placement of one or more optical media in the light path output by the reflector.

Abstract: The present invention generally relates to methods of controlling UV lamp output to increase irradiance uniformity. The methods generally include determining a baseline irradiance within a chamber, determining the relative irradiance on a substrate corresponding to a first lamp and a second lamp, and determining correction or compensation factors based on the relative irradiances and the baseline irradiance. The lamps are then adjusted via closed loop control using the correction or compensation factors to individually adjust the lamps to the desired output. The lamps may optionally be adjusted to equal irradiances prior to adjusting the lamps to the desired output. The closed loop control ensures process uniformity from substrate to substrate. The irradiance measurement and the correction or compensation factors allow for adjustment of lamp set points due to chamber component degradation, chamber component replacement, or chamber cleaning.