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I make that comment cus the Old Lady' is after me to stain the fence... Seeing I bought the stain 3 years ago?? I wonder why shes bitching? Women.. But now the grow room, I'd use artists brush to whiten my walls. Reflection is 60% as good as direct. Sorry white is one of my pet peeves.... Makes a world of difference. She'll be after me today to get started,,, I be thinking. Oh well Keepem Green
Your point about reflective white is well made!
In the veg area, my plants are next to the white brick wall and 2 feet away from the unpainted wood.
In the flower area, I was running 75-100W per sq ft of HPS light. It didn't seem like reflection was going to be an issue. Since I replaced one of the HPS with (lower wattage) COBs. It's probably more important.