Westinghouse R40 125 W clear E26 (medium) base incandescent infrared heat reflector light bulb 0390700. The incandescent soft glass infrared heat reflector light bulb is available in a standard R40 shape. These light bulbs last on average 5000 hr. This reflector with a medium screw base is ideal for heating areas such as, bathrooms, saunas as well as animal habitats and in heat therapy applications. For use in sockets and fixtures designed for infrared heat bulbs. Brass base minimizes lamp base corrosion in the socket.