I never said anything bad about cfl's, i said plenty of people grow with them. Why would I need to run 220 to run a hps? Its an option but certainly not a necessity. When someone tells me I want to grow large plants, cfl isnt the first thing that comes to my mind. If someone ever shows me a pound of straight cfl grown bud out of 23 watt cfl bulbs out of a 4x4 tent il be praising them as much if not more than the next guy. A 400 watt isnt designed for a 4x4 tent, unless your doing a vert grow or a sog grow i wouldnt recommend a 400 for anything bigger than 30x30 for good buds. I run a 600 in my 4x4 and it works good but I could use a little more. Cfl bulbs are cheaper, but not when u use 20 of them for a grow + 10 splitters+ 10 sockets. Heat really isnt an issue with a vented hood and inline fans arent loud if you suspend them with a bungee cord and use insulated duct. Cfl has its place but not for growing big plants.