I’m really considering buying 8 new bulbs for my 1.8x4 8 tube t5 HO by Hydrofarm. My dinosaur. I have 15 of these actually. I got first dibs on a raided home and police didn cut any cords at all. I even got over half lb of wax from a purging machine they never even opened. Lol. Good day that was. Anyways. I used these things for a couple years ina row. Never flowered under them. But my clones rooted faster. And veg was healthier under these lights. And the spread seems like it would fill a 2x4 very nicely. 2 of these will veg a 2 door closet full. Facts. But I also thing my watt from wall is 438. And it can only be ran at 50%. Which is 4 bulbs and not the entire 8.