Athosanswered grow question 4 years ago Dude I use led bulbs and they work great. The issue you have in your setup is that your light is more appropriate for a 2x2 tent (60cm x 60cm). Keep in mind that for veg you need 25 to 30 watts per sq ft at least and for bloom 30 to 40 watts per sq ft. IF you really want to take advantage of your DS 90 tent, you need like 250 watts for veg and 350 watts to 500 watts for bloom (I'm giving you rough numbers)