GE 10004 - F4T5/CW - 4 Watt Fluorescent Tube - T5 Linear Fluorescent Tube - 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 GE T5 6 inch fluorescent bulb, 4W, Base: G5 2-Pin, Color Temp: 4100K, Rated Life (hours): 5000