GE Linear Cool White Medium Bi-pin (T12) Fluorescent Light Bulb (30-Pack)GE 40 Watt T12 Cool White Fluorescent bulbs provide cool, neutral white light. Their cool white light is ideal for illuminating large spaces. These bulbs are rated to last 18 years based on 3 hour per day consumer use. Use these 48 inch long fluorescent bulbs with a 1 1 2 inch diameter in basements, garages and commercial applications like warehouses and industrial buildings. Uses 40 Watts (2600 lumens) 4100 Kelvin cool white light Rated to last 18