Bulbrite 106940 - 10PK - 40W - T10 - Medium Base - 120V - 2850K - 500Hrs - Black Light - Incandescent Light Bulbs 40 Watt, 100 CRI, 120 Volt, 2850 Kelvin, 500 Average Rated Life Hours, Medium (E26) Base Dimmable Sturdy design and manufacturing makes this bulb last longer than standard black lights; reduced visible light combined with the lamp's natural heat also simulates "night time" in reptile tanks 10 - Incandescent T10 Black Light Light Bulbs