Quantum T5 HO 4' 54w Blubs 6500k (Box of 8) VERY HIGH OUTPUT T-5 Lamps: Triphosphor coated. Great for the Vegative Stage of growing 88 Lumen / per Watt 6500 Kelvin / 4,752 lumens per lamp High Lumen Maintenance : 90% over 10,000 hours 8 pk. lamps Shipping box - 4.3