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In general you want to give the plant as much light as possible. It's more important that you give it the right spectrums during veg'ing and...
We'd need to know more than just the height, how wide and how long is the space? Either way, 5" for HPS is pretty close, you can't even put most...
I'm no expert but I'd say robotic. You can always add some stationary CFLs or LEDs to supplement too.
Start off at 12", move further if you see any burning/laser spots
Keep in mind most LEDs operate somewhere around 2/3 of their stated wattage, so you're likely to get 30W out of that light (assuming it's a high...
I don't have the links to the threads where this is discussed, but yes I just read about this yesterday. One of the BEST ways to use LEDs is to...