Ushio 1001391 - QIH480-6000RI Heat Lamp Light Bulb Highly Efficient Heat Source - Over 85% of the input energy is converted into infrared energy. Ease of Control - As opposed to combustion heat energy, our light source based energy is easier to control and manipulate by use of lenses and reflectors. Compact and Clean Energy - A non-polluting heat source from a light weight and compact footprint enables flexible design possibilities. Instant On/Off - Due to the ability to reach maximum output upon ignition, a sophisticated heating programming can be applied. Long Life and Consistent Output - By utilizing the halogen cycle, USHIOs lamps are designed up to 5000 hrs with almost no loss in infrared output.