Triangle Bulbs T30013 F4T5/D Fluorescent light bulbs. This bulb is 4 watt, T5 shape (Five eights of an inch thick), 6 inches long. This bulb is a Daylight color (6500 kelvin), offers 8,000 hours of life and of 145 lumens of light, The pins are G5 (mini bi-pin base). Ideal for residential use in kitchens, bathrooms, garages, basements, as well as for commercial use and industrial applications.