Philips 26822-7 - PL-T 18W/41/4P/ALTO - 18 Watt Triple-Tube Compact Fluorescent Light Bulb, 4100K Fluorescent bulbs are energy saving bulbs and last up to 10 times longer than incandescent bulbs Fluorescent bulbs help you save money using 40 - 70% less energy than incandescent bulbs Fluorescent bulbs are 5-8 times more brighter (more output lumens /watt) than incandescent bulbs Philips Triple Tube 4-PIN fluorescent bulb, 18W, Base: GX24Q-2, Color Temp: 4100K, Rated Life (hours): 16000