Incandescent infrared heat reflector light bulbs are available in a standard R40 shape. These light bulbs last on average 5000 hours. To help you find the right bulb for the right application, see Westinghouse's full offering of infrared heat light bulbs, which are available in multiple wattages as well as clear and red finishes. These reflectors with medium screw bases are perfect for heating animal habitat. They are also compatible for use with standard household fixtures including bathroom heat lamps.