GE Lamps Quartzline Fluorescent circline lamp features cool white light appearance. Circline measures 1.125 inch diameter x 12 inch with four-pin base. It has a color temperature of 4100 Kelvin and color-rendering index of 60. It has T9 type bulb made of lead glass with a lamp life of 12000 hour. It provides an initial brightness of 1950 lumen and mean brightness of 1460 lumen. It has a power rating of 32 watt and voltage rating of 84 volt. It is suitable for use in large spaces such as basements, garages, office and utility use. Great for use in large spaces such as basements and garagesLasts 5.5 years based on 6 hours per day usage1.1" diameter T9 circline (g10q) baseCool white lightProvides 1950 lumensUses 32 wattsGE garage & basement circline fluorescent bulbs" cool white light is perfect for illuminating sizeable spaces throughout your home. Use in large open spaces in your home including finished and unfinished basements, garages and rec rooms.