..its a chamber/tent made from transparent plastic sheet so its got virtually no reflective quality, its also up ina loft and the temps on the last 2 grows have been shit poor, about an oz a plant, so itll help with heat retention both by reflection and by insulation, also this time there gonna be 2 x 600s instead of one so im hoping the temps will be up near the proper level, fuck they were down as low as 15c at some points. if it needs any further help im gonna insulate it with old blankets and maybe one of those tube heaters. but im bored waiting, id planned on having it up and set yesterday to give me a week to tweak any shit and check light spread/temps etc.