When I moved to Alaska one of my biggest problems was keeping my grow warm, so I assembled a 3 fridge setup with one fan with ability to discharge or recirculate air based on a tstat. Both fridges on the right had 250w HPS lamps in cool tubes of my own making. The plants were roughly 2" from the bulbs. The one on the left was a veg chamber on bottom and cloning trays in top. Happy Growin' w Happy Growin'