Incandescent infrared heat reflector light bulbs are available in a standard R40 shape. These light bulbs last on average up to 5000 hours. These reflectors with medium screw bases are perfect for use in brooder lamps. They are also compatible for use with standard household fixtures including bathroom heat lamps. These Available in multiple wattages including 125, 250 and 375sLast up to an average of 5000 hoursR40 infrared heat light bulbs available in clear and red finishes