Glo Marine-Glo T8 Fluorescent Aquarium Bulb, 30-Watt, 36-Inch The Marine-Glo T8 is a linear fluorescent 30-watt and 970 lumen aquarium bulb This normal output bulb delivers a powerful actinic blue light emission, fits all suitable standard and electronic ballasts This fluorescent bulb is essential for all saltwater aquariums Measures 36-inch length This product weighs 0.45-pound