>>960799With trees that size, the amount of soil they take up will be negligible. It would be different with really old trees or a tree in an area where it needs to extend roots due to low moisture problems.
>>960817Another consideration is using large bubble wrap in the colder months. Cut to size for each area, label well with a permanent marker. You'll be able to take it down and put it up without much fuss. The only downside it needing a place to store it. Make sure the flat side faces away from the glass.
To answer your question, yes a LUX meter will measure the luminance in a given area. An extra piece of glass lowers the overall light by 10% on average. Some are better or worse than others of course.
>>960793Yeah, lots of stuff that are not connected to each other are a big help to gain a better coverage knowledge. Those one-site-does-everything places and aps shoot themselves in the foot by trying to be everything or at least saying they have it all.
