Exo Terra Porcelain Wire Clamp-Lamp. The Exo Terra Wire Light has a heat resistant porcelain socket. Ideal for use with Heat Wave Lamps (ceramic heat emitters), self ballasted mercury vapor bulbs and all types of regular incandescent bulbs. The wire guard prevents unnecessary heat build-up. The device is sturdily constructed, with a heat resistant ceramic socket, and a spring-loaded swivel clamp. It can be easily turned off and on by the switch, mounted on the extra long power cord (6 ft). Available in 2 sizes; Size: Small, 14 cm (5.5") diameter. Designed to withstand up to 150 Watts