Abstract: A light emitting system comprises an LED-based light emitting device and a controller for controlling operation of the device. The device comprises at least two LEDs that are operable to generate light of different colors that contribute to the emission product of the device. The controller is operable to control light emission from the LEDs in response to the measured intensity of the first and second color light contributions in the emission product. To measure the individual light contributions the controller is operable to interrupt, or at least change, light emission from one LED for a selected time period and during this time period to measure the intensity of the emission product of the device. The intensity of light of the first and second color can be determined by comparing the measured intensity with the measured intensity when the light emission from the other LED is interrupted or changed.

Abstract: A method for fabricating a self assembling light emitting diode lens is disclosed. The method includes providing a first fluid with a first viscosity and a second fluid with a second viscosity. The refractive index of the first fluid is the same as the refractive index of the second fluid. Then the first fluid and the second fluid are blended in a predetermined ratio to obtain a third fluid with a third viscosity. Then the third fluid is dispended on a light emitting diode, which is disposed on a substrate. The third fluid is cured to form a lens on the light emitting diode. The shape of the lens is controlled by the third viscosity.

Abstract: A light emitting system comprises an LED-based light emitting device and a controller for controlling operation of the device. The device comprises at least two LEDs that are operable to generate light of different colors that contribute to the emission product of the device. The controller is operable to control light emission from the LEDs in response to the measured intensity of the first and second color light contributions in the emission product. To measure the individual light contributions the controller is operable to interrupt, or at least change, light emission from one LED for a selected time period and during this time period to measure the intensity of the emission product of the device. The intensity of light of the first and second color can be determined by comparing the measured intensity with the measured intensity when the light emission from the other LED is interrupted or changed.

Abstract: An LED-based light emitting device comprises: a substrate; at least one LED die mounted to the substrate; at least one bond wire that electrically connects the LED die; and a light transmissive material (silicone) encapsulating the at least one LED die and at least one bond wire. The at least one bond wire has a hook-shaped portion that loops back on itself.