I'm going to acquire a 150 watt HPS kit soon, to add to my girl 35 days into flowering. I was wondering how much heat I should be expecting the kit has a small built in fan it looks like.
i have a 150w HPS and they do still generate quite abit of heat. i use it in my grow tent and temps get in the 90's sometimes. but with good ventalation and fans blowing should help..
Well currently 150 is the only one I can find/afford. Also I have two 9 inch desk fans at the bottom of my girl and they're constantnly blowing so I think it may be enough.