To preface: I am unsure why you took such a defensive stance towards my advise. I apologize if you took offense but you cannot say any of it was lacking.
I appreciate your words of encouragement. HOWEVER, your not a grower, your just starting, so advising on things you don't know shouldn't be done.
That's like saying "Hey. You've never put your hand on a stove so you shouldn't advise me on whether or not I should do it. "
If you looked at the pictures my "suitable substitute to Mylar" is flat white vinyl tape.
Mylar97%reflective flat white 95% Which is cheaper. FLAT WHITE! How much of a difference does it make from mylar? NO MESURABLE difference in my experience. My reflector up top was done with Aluminum tape. NO IT WILL NOT CAUSE HOT SPOTS WITH CFL LIGHTS!
I don't have to have growing experience to know that vinyl is not 95% reflective. Especially when it is that thin. I'm glad you haven't found a measurable difference between the two. If you truly like the vinyl tape why not tape your entire enclosure?
AS FOR USING MYLAR!!!! it drives me nutz that people are like mylar this and mylar that. MYLAR is not economical concidering it's cost to flat white paint.
Mylar is about the same price as paint. You get more out of it, and it's vastly more reflective.
You could purchase twelve mylar emergency blankets for
fourteen dollars, or you could purchase 25 feet of 2 mil pure mylar for about
twenty bucks. It's not expensive. Not even relatively to flat white paint.
There's a mere 2% reflective difference.
It's more then two percent. Much more. It doesn't matter much since you are content with your results usig what you are using.
I could be wrong and don't feel like breaking out the calculator so if you could provide some proof to back up your claim I would be very interested in reading it.
Edit: My lack of experience growing marijuana is in no way a reflection of my knowledge of growing plants in general. Also I am into min/maxing as much as possible. I find pushing even two or three metrics to the best attainable conditions for any given environment can and will produce vastly superior results.