The larger blade in your picture is burned and that is usually the neutral. Get a tester and make sure you do not have a polarity issue, if it was a loose/dirty connection it is possible the polarity is fine. 12 guage wire is always the way to go. I think its a good idea to use as few extension...
Secret rooms are the best!
If you have enough space you can put a couple tents in there to do a perpetual pretty easy. If you are handy and have some tools have fun building it yourself!
Mdf and cardboard suck in growing environments. Literally they suck up all the water and swell and peel and mold and get wrecked quick. Even particle board isn't great with water. Plywood is the most durable. I don't know what it is but everything seems to get wet when watering plants. White...
Small indicator LED's are going to need to be very bright and very close to your plant to affect it. A green led will do nothing no matter what. How bright can the moon get?
I tend to be clumsy and bump lights n shit so I like having a cool tube to protect me. I agree if the air passing through them isn't filtered they can loose alot of light and be a pain to clean. I think its a good idea having the lights on a closed loop from one part of your home venting out...
I had a 400w in a space not quite as long and i had to spend the money and get a good quality 4" centrifugal to run through a cool tube and another 4" pulling through a carbon filter. I was able to turn them down abit making it alot quieter. T5's and you should get away with just one fan on a...
I just looked at flip flop timers too and found the same thing. Quality timers rated for the 8-9 amps your drawing should hold up... It is somewhat risky but all you would do is trip the breaker when the second light tries to fire up.
Pull air from inside out, use a passive intake. I like to keep the filter separate from the cool tube setup.
You can even keep the fan and filter outside of the room just make sure your connections are 100% sealed.
I had a knocked over cup about a month ago. Not as high as your fall tk and no explosion but the roots were totally out! She's come back to be star of the garden!