Black outer / white inner bulb holder can be used on top of Vivarium's which have mesh tops to provide a heat source. This unit has a ceramic holder for use with screw type bulbs (E27 - 1" diameter thread) up to 250W. The cable has a switch, and it is also supplied with a clamp which allows the holder to be fixed to the top of the cage, etc. For use in brooders, Vivarium's, planters, etc. The holder can be suspended using a handle mounted in the top.
