Of course the viparspectra is only 276w actually but I've seen these baby's do very well. I am moving and as a result my 2x4x5 tent will be in the basement (during a very cold winter). I've got 4" inline fan for exhaust with 4"x12" carbon filter and ducting to take the air directly outside... Like, OUTSIDE outside. With the LEDs I have (old Mars hydro 300 replica) now... when I bought them earlier this year (during winter) I had to buy warm mist humidifiers for veg but also to keep the tent warm. Will the heat from mh/hps keep my tent warm during winter? I know a heater will use more power thus costing more in electric and... I found both hps/mh 600w full cooltube kit for the same price as the viparspectra 600/276w actual. Which one should I go with?