PENN PLAX AQUARI-LUX INCANDESCENT AQUARIUM BULB   T-10 MEDIUM BASE. 40 WATT. PLEASE CHECK YOUR HOOD TO MAKE SURE THIS WILL WORK. ELIMINATES YELLOW CAST, ENHANCES COLORS, AND BENEFITS AQUARIUM PLANTS. BRAND NEW OLD STOCK. PACKAGING MAY SHOW SOME WEAR. BULBS WILL BE TESTED BEFORE SHIPPING.