I am still on SE HPS but finally may start making a move toward QB. My idea was to keep some SE HPS for winter and do a mix. The question is - are QB's and COBs warm enough in winter? Say at night the outside is below zero. The somewhat insulated building would probably be close to 40 F with no heat on. Can you run space heaters in the room to get it to the 70 to 78 deg F range? Do the plants need radiant heat from the lights? I know COBs can put out some heat but QB's are pretty cool to the touch? Thanks.