Hello, everyone. Trying to plan out my new grow space and wasn't sure which light to get. Figured it's always best to get the biggest light I can, but I wasn't sure about the heat it'd put out for the space I want to use. I was wondering if I went ahead and bought a 600 Watt light and it turned out to be too hot, could I put a 400 W light in the same unit? I know this is fine with everyday lights. (I can put a 40 W bulb in a 75 W lamp.) I'm just not sure given the ballast and everything if that would cause some sort of problem. Any help would be great. Thanks!