Designers Edge H11075 7-3/8-Inch Replacement Infrared Heat Lamp Bulb, 620-Watt Replacement heat lamp bulb is 620-watt 130-volt bulb Designed for use with HL-185 radiant heater Made for Designers Edge HeatZone Patio and Shop Light Heaters Infrared heating technology - radiant heat warms the skin up to 8 feet in front of the heating element