A specialist Marine IODE 1 Floodlight Lamps traditionally used in industrial ports, marinas, docks, harbour entrance lighting and jetties. With a Giant Edison Screw base this 38mm diameter halogen light bulb operates at 110-130 Volts and is rated at a high 500 Watts. This is a good replacement for traditional incandescent lamps featuring a double envelope bulb and a clear finish. This marine navigation lamp used in exposed floodlights averages a 2000 hour life span.