Abstract: The present invention is a thermal dissipation system for a ballast of a lighting system. The thermal dissipation system comprises a ballast housing that is adapted for engagement with an elongate support of a common lighting system. The ballast housing comprises a thermally conductive material and is made to substantially house a ballast therein. The ballast housing has a body and thermal transfer surfaces that are shaped to substantially conform to portions of the inner surface of the support. In one aspect, the thermal transfer surfaces of the ballast housing are integral with the body of the housing. In another aspect, the ballast is housed within the body.

Abstract: An internally illuminated sign is capable of being mounted on a lighting track. The sign includes an adapter for mechanical and electrical connection to the lighting track. A display housing is connected to the adapter. The housing has a substantially vertical face with a message window in the face. A translucent message assembly is removably mounted in the housing adjacent to the window. The housing has a movable section selectively relocateable relative to the message window to provide access to the interior of the housing for selective insertion into or removal from the housing said message assembly. An illumination source is mounted in the housing adjacent to the side of the translucent message assembly positioned away from the window to enhance visibility of a message on the message assembly through the message window.

Abstract: An internally illuminated sign includes an adapter for mechanical and electrical connection to a lighting track. A display housing is connected to the adapter. The display housing has a face with a message window in the face. A translucent message assembly is removably mounted in the housing adjacent to the window. An illumination source is mounted in the housing adjacent to the side of the translucent message assembly positioned away from the window to enhance visibility of a message in the message assembly. The display housing has a separable portion selectively relocatable relative to the remainder of the housing. Relocation of the separable portion away from the remainder of the housing provides access to the interior of the housing for selective insertion into or removal from the housing the message assembly. A lock releasably secures the separable portion to the remainder of the housing.

Abstract: A channel-shaped insulator is received in a channel-shaped metal track. First and second conductive bus bars are mounted in holders within the insulator, which has wall portions disposed between the track and the bus bars and affording spacing therebetween. The track is formed with first and second longitudinal grooves opposite the bus bars and affording additional spacing between the track and the bus bars. First and second longitudinal ridges are formed on the insulator opposite the first and second bus bars and extending into the grooves for engaging the track to maintain the additional spacing. The depth of the grooves preferably corresponds with the thickness of the wall portions of the insulator between the track and the bus bars. The height of the ridges preferably corresponds with the depth of the grooves. The provision of the grooves and the ridges may increase the minimum spacing between the metal track and the bus bars from 1/32 of an inch to 1/16 of an inch.