Deluxe Porcelain Clamp Lamp - 5.5" This Deluxe Porcelain Clamp Lamp fixture is ideal for use with all types of incandescent heat lamps and compact fluorescent UVB lamps. This Clamp Lamp fixture has a heat-resistant porcelain socket that handles up to 100 watts. Includes an inline on/off switch for greater convenience, and features a polished aluminum dome for maximum light and UV output. cUL Listed. 5.5" diameter. Lamps and heat emitters sold separately. The unit is not compatible with ceramic heat emitters. 5.5" dia.