Abstract: To provide for heat transmission of fluorescent tube accessory apparatus, a etal plate (16), for example of aluminum, is attached to the fixture structure which, otherwise, is entirely of plastic, having a base (3), a transparent closure cap (5) and an opaque cover cap (4). The caps (4) and (5), together with the base, define a chamber within which the lamp (2) is located, including the socket (6) thereof. Electrical accessory equipment (14) for the fluorescent lamp, for example starter, ballast and similar apparatus, is located against an internal support plate (15) which divides the chamber, the plate (15) having a reflective surface (22) facing the tube (2), and forming an attachment surface, at the same time, for the accessory apparatus (14). Plate (15) itself, is secured to support elements, such as posts and nipples (17, 20) extending from the support base interiorly of the chamber. All elements within the housing, thus, are double-insulated by the insulated housing structure itself.

Abstract: A circular fluorescent lamp unit comprises a circular tubular fluorescent mp; a housing secured inside the space formed by the circular fluorescent lamp, the housing containing the ballast and starting device; and a base for connection to a supply voltage, the base being connected to the housing concentrically with the circular fluorescent lamp. The improvement resides in that the housing is an elongate hollow body which extends diametrically across the space defined by the circular fluorescent lamp; the housing having one end for enclosing the ends of the circular fluorescent lamp and another end for taking support against the wall of the circular fluorescent lamp which is diametrically opposite to the ends of the circular fluorescent lamp. In a preferred embodiment, the housing comprises two interconnected form locking housing cup-shaped members.