Satco 13 Watt Compact Fluorescent Twin Tube 2-Pin Light Bulb - GX23 Base, 4100K - CFS13W/841 model number S8312-SAT 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 Satco Single Tube 2-PIN fluorescent bulb, 13W, Base: GX23, Color Temp: 4100K, Rated Life (hours): 10000