Abstract: A thin illuminated sign is described which is formed of two essentially mirror image frame members at least one of which has a central opening therethrough to expose a translucent sign element including signage indicia associated therewith. The frame elements contain mirror image mounting members adapted to support therein a mounting channel for a cold cathode florescent tube along at least one of the edges of the translucent member for projecting light therein.

Abstract: An air disinfection method and unit are disclosed in which air is passed through a housing from an air inlet to an air outlet opening at a predetermined air flow rate under substantially uniform cross-sectional air flow conditions across closely spaced UV-C irradiation lamps located at a distance of between 2 to 4 inches O. C. with the lamps being positioned directly in the air stream so that all air flows passed the bulbs at a distance of not more than 2-3 inches. The bulbs produce UV-C irradiation at a wave length of about 254 nm and have an intensity of about 142 .mu.W/cm.sup.2. The housing has a predetermined volume selected such that airborne bacteria remain in the enclosure for a residence time of between 0.5 and 1.5 seconds.

Abstract: An articulated lamp is disclosed which is formed of a vertical support arm and a transverse support arm articulated to the top of the vertical arm and having a lamp head articulated on one end thereof. The arms are connected to each other by an articulation joint which permits restricted universal movement, in order to protect the power supply wires passing through the arms. The head is articulated to the transverse arm by an articulated joint which is formed of components that are identical in construction to the components forming the joint between the arms. The articulation joint between the transverse arm and the head also permits universal movement of the head relative to the arm, but again with restricted degrees of movement to protect the wiring of the lamp.

Abstract: A recessed track lighting system includes a housing recessed in a ceiling and having a top wall, an elongated opening spaced downwardly from the top wall and a channel along the top wall extending parallel to the opening and laterally centered in respect thereto, and at least one light fixture mounted in the housing by means of an adapter releasably engageable in the channel and being movable therealong. The adapter defines an axis of rotation that substantially bisects the width of the elongated opening and a lamp head support in turnable about such axis of rotation and has an arcuate guide extending generally radially from the axis of rotation. The arcuate guide has a curvature centered substantially at the lateral center of the elongated opening, and a lamp head is adjustably mounted on the arcuate guide and includes a light source directing light along a light beam axis which, in all positions of the lamp head along the arcuate guide, intersects the axis of rotation at the plane of the opening.