Aluminum foil was a dirty word when I first came here. Now it seems that a lot more people have been using it than will admit. I've had great success using the dull side. I ran my Minolta Auto Meter IIIF light meter along both of my grow room doors--one mylar and one foil--and had identical readings.

Not saying it's right or wrong; just my experience.
9ski9 Reviewed by 9ski9 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