tin foil also causes hotspots and is not a "good" source of reflection for the plants. Please do yourself a favor and order some mylar.
budman2000 Reviewed by budman2000 on . Aluminium?! Can i use aluminium foil to reflect the light of my growroom and if yes do i use the dull side or the shiny side? what's the OLH (optimum light height) of a 250W HPS? and thirdly how much bicarbonate of soda to vinegar should i put to produce half a cubic foot of CO2? Rating: 5