The traditional die-cast metal box housing a bulb. Side-fins on the outside of the enclosure assist in the heat dissipation. Provided with a set of vertical-grooves on inner side for accommodating various 45mm wide mountings such as slit plate and cylindrical lens. The 12V bulb has a vertical filament mounted in SBC bulb holder with a two core flexible connecting lead terminating in a pair of 4mm banana plugs. Supplied complete with slit plate, double ended single/triple. Requires a low voltage DC lab. power supply to operate.