Product details:

12Pk - Sylvania 40w U-Shaped T12 4100k Cool White G13 Fluorescent Tube Light. 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 Osram Sylvania U-Tube fluorescent bulb, 40W, Base: G13 2-Pin, Color Temp: 4100K, Rated Life (hours): 18000