T5 lights are great even when budding under them. The heat output is much lower then HPS and I love how even the light distribution is. I use two four foot four bulb lights and use 6 flowering bulbs and two veg bulbs to keep a nice wide spectrum but mostly in the 2800. I used to use them for veg but now use two 150 watt cfls which are even cooler and the plants veg great. The t5's grow some serious buds under that amount of light and heat is minimal. HPS can grow bigger buds but more wattage is needed and the heat is too much for many. Hope this helps