Ecolux T8 GE daylight T8 HO lamps can be used in any standard T8 4' fixture. Rated at 20,000 hours of life. The 6500k spectrum is great for cuttings, seedlings, propagation, and vegetative growth. li>2700 lumens CRI - 78 Rated life - 20,000 hours Length - 48 These daylight T8 HO lamps can be used in any standard T8 4' fixture.