Sunlite F16T4CW 18.75 inch 16w Cool White T4 Fluorescent Bulb 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 Sunlite T4 fluorescent bulb, 16W, Base: Miniature Bi-Pin, Color Temp: 4100K, Rated Life (hours): 10000