I was thinking that since it's an IR light it would hurt the brew.. I guess there's only one way to find out! If in I'll go with the coffee can idea.. probably cut wholes top and bottom so air can circulate and crate some sort of shield to block most of the light.
The box isn't that big even a coffee can with holes in it woul dlet out enought light to light up the space.. Here's a picture with the IR light on.
