It raises the temp a few degrees, compared to 20+ degrees for HID lights. I'm currently testing LEDs out for the second time, I have had a 4' long panel that's 150w for about 7 or so years now. It's good for veg and would be good commercially for budding if I had a warehouse and 20 of them. I prefer to keep my plant count to a minimum, so this time I got a 340w panel that's roughly 8"x12" and that should be enough to get a decent footprint for 2 or 3 plants. I've been using it for a few weeks now and it's working very well for me. In two weeks of veg I went from this: To this: Plant on the right was the one pictured before and after one week under these LEDs I had to chop the top 3" off to keep it from getting too big! Now I'm budding and we'll see how it performs. I don't expect results like my 600w HPS, but using less electricity and producing less heat to cool is worth it right now. I think I paid $65 for one of the cheap generic ones on Amazon. I'm hopeful that this light will be very worth it.