An economical metal Ray Box comprises of a die cast enclosure, delivers white light but runs much cooler than conventional incandescent lamp models. It uses the latest cool ultra bright LED technology giving superior white light. Supplied complete with slit plate and its own battery power source (2 x AA size batteries not supplied). LED Ray Box. Spares available; Plano Convex Lens (Code 0326), Spare Slit Plate (Code 0329), Spare Bulb (Code 3185).