Agrobrite T5 4 Foot Replacement Lamps 6400K 54W Case of 20

20 bulbs per packT5 4' Replacement 6400K Bulbs, 54WHydrofarm's T5 replacement tubes offer HO light output at a great price. Full daylight 6400k spectrum, rated for 20,000 hours of life, and compatible for all T5 fixtures we offer. 54W puts out 5000 initial lumens per tube, 24W puts out 2000 initial lumens per tube.