The panda film. It wasn’t much cheaper though, I’d probably just do the Mylar.
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Outside the tent I staple sheet bubble insulation. 4 FT wide roll, about 1/4" thick, bubbles sandwiched between 2 sheets of Mylar.
It was surprising to see how much light is being sucked up bu the blackness of the tent. I added a piece to the floor and am going to tape some to the tent.
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From my experience shiny stuff creates direct reflection, and won’t be great in every situation. This is why tents and most of the mylar options horticulture specific have distorted surfaces. In theory you get same effect from a flat or low gloss white surface. I don’t know that every available option has been tested against each other, and it’s been a long time since i looked, but white surfaces stood up extremely well against tent walls last i knew.
I think either or is a big difference from running without any surface surrounding canopy. Also would give some consideration to type and design of lights in use. If running a light designed to be used close to canopy, reflection will be less of a factor.
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I’m not sure if the reflective insulation is better than others but it worked for me since I needed a bit more insulation in my rooms
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I agree with everything above.
Low gloss white is great, quality diamond shaped mylar is a bit better but nothing to worry about.
If I need the insulation value I would probably be fine with bubble wrap as well.
Avoiding light absorbing surface coverings is the key here.
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