The 2x2 part will be fine... It's the 3ft of height that will be an issue. Think about the height of the container the plant will be in, the amount of distance you need to leave between the light and the top of the plant, plus the amount of height the light itself occupies and there really...
To the OP.. first thing that will help is tailor your light/dark schedule to minimize the negative aspects of your ambient temps. You said it ranges between 55 and 64. Assuming the 55 is at night so make sure that your lights on period is at night. The higher daytime ambient temps will be...
I haven't been diagnosed with ptsd, but I have some pretty gnarly anxiety/panic disorder with a large side order of insomnia. A mind erasing couch lock indica is about the only thing that keeps me functional and sane.
Considering you can match the ppfd of a 1000w HPS with ~600 watts of high quality cobs, (which leaves you with ~400 watts to use for a heater) and you end up with light that eats up less headroom in your tent and doesn't require regular bulb replacement, I wouldn't exactly call it a case of...
If it was in stock from wherever you ordered it from it shouldn't be more than a week. I believe I saw you posting in one of these threads that you found a place that was an authorized HLG distributor that had one.
If at all possible I'd try to keep it at least 12 inches from the top of the plant. Two reasons for this.. If you look at the ppfd charts I've included from the HLG website you will notice that at 12 inches the numbers in the center are higher than you probably need. This means an increased...
The QBs can be run very close to the top of the canopy. I've seen people who run them 8 or 10 inches from the tops with no issues and seen claims made that you can get even closer than that (can't confirm).