Wait Gold,I'd use pure 24k Gold Sheeting on your wall,Any light that were to come off of this would give it super sunlight effects. I think silver would be great for veggie stage I can't wait to grow ):
Have you considered ORCA Grow Film as an alternative to Mylar? It appears to reflect more lumins if I understand it right.
IMO, going crazy with reflective surfaces is just a waste of time. Once light gets refracted ONCE, the output is 1/94th the lumens. Mylar is just something else to sell you. Flat white paint is ur answer and keep the girls away from the freshly painted room for at least a day. Fumes cause issues.
^I agree. OP, I line my grows for aesthetic reasons more than anything else. If there's a benefit to that, then great. I didn't know they sold gold mylar, but I think it will look cool in my flowering box because my silver-lined veg box is right next to it. I think the contrast between lighting stages is neato.... my $.02