A ventilated Ray Optics box open fronted with extended sides finned externally for heat dissipation and vertical internal grooves to accommodate a slit plate and cylindrical lens. It includes a 12 volt, 21 watts lamp with one meter of twin flex ending in 4mm connectors, a single and triple slit, whitened on one side, black matt on the other. Operates on 12 volts power supply which is not included. 45mm width: not suitable for use with 50mm filters.