Thought: Aluminum foil does IN FACT cause burning from all the shitty creases it leaves in the plants and creates a bad reflection to one area of the plant thus leaving what is called a burn....
Shitty creases it leaves in the plants? WTFdood????
How can foil shittily crease anything if some leaves are just resting on it?
Burning from a "bad reflection?" Using foil isn't like using a magnifying glass under the sun! If anything, a ''bad reflection'' would mean light simply isn't getting somewhere. If you think about it, when a leaf is covering mylar, it's not like anything is reflected back to said leaf. That doesn't imply burning of any sort.
Foil is not a great reflector, but it works in a pinch. Chances are you have some lying around the house already. I have yet to see any of these so-called side effects from foil. As a matter of fact, I have yet to see a lot of things people claim here as well. There is just as much bad information as there is good, and it took a year of lurking & experimenting to find that out.
The only burns I've experienced are from leaves directly touching the bulbs, using too much N fert, or having a pH out of range.