T5 4' Replacement 6500K Bulbs, 54W, case of 4-FLT5464, Pack of 4
Hydrofarm'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. Price is for a  case of 4 bulbs.