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That's a pretty good idea. I have some of that foam insulation with the reflective facing, I should try that.

The white Styrofoam insulation would be more than decent at reflecting, if it has a reflective facing even better but I wouldn't use aluminum as that will hold/absorb heat and radiate it onto the plants, I'd see if the insulation does that as well by testing it with the back of your hand once you think it's sat next to the light enough. If it's hot to your skin it might be wise to try another thing.

He could avoid the excess of light inside the room doing something like that all around the plant.

Ofc, but that takes more effort :D sticking some reflective things on the walls takes 20 seconds.

Smokers thoughts hehe.... Or you can do it easy mode with raft wood sticks and glue, very cheap too.

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