Hydrofarm MAXLUME 8 Bulb Fixture with 8 T5 Grow Bulbs, 2' Maxlume 2 foot, 8 Bulb Fixture, Includes 8 T5 Grow Bulbs T5 high output fluorescent lighting is the wave of the future in indoor horticultural lighting They put out very little heat (about 20%) as compared to a conventional H.I.D. Light