The Sun-GLO T8, 40 W linear fluorescent aquarium bulb generates a natural-looking daylight spectrum with a refreshing natural white light for a balanced and natural look to any aquarium. Sun-GLO is an excellent aquarium bulb for emitting a warm white light that is most suited to freshwater community setups. This normal output bulb has a colour temperature of 4200K and fits all suitable standard and electronic ballasts. Size: 122 cm (48 in). T8 Bulb 40 W 3,100 Lumen 4,200 K 20,000 Hours