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It comes down to cooling and cost IMO. If you have a source of fresh, cool air and a strong exhaust the 1000w MH / HPS will grow a nice canopy of hard buds with great penetration. As already stated you can compare the cost of LED lighting vs electric savings to see if it's worth it to you. If...

You don't happen to have a fan hitting the droopy plant hard, do you?

Unless you're going for SOG, plant count is not that big a deal IME. With LST, scrog, topping etc, one trained plant in a big pot will yield as much as a bunch of small plants in smaller pots (exception is SOG, but that's another topic). The goal is to fill the tent with buds. You're set up well...

Another 2+ weeks IMO. There are lots of pistils standing tall. Watch for the pistils to shrivel and recede into the buds and calyxes will swell. Don't go by trichomes on the leaves, need to look at trichomes on the calyxes.

New coco with a high ppm could be salt in the coco. It says it's washed but it doesn't hurt to rinse it, just so you know the ppm is reasonable to start.

If you're using coco, 6.3-6.5 PH is a little high.. Somewhere around 5.8 is good.

Temp around 70 F, RH in the low to mid 60's, small fan aimed at a wall and away from your buds. Some people like 70 F, 70 RH for 7 days but the RH is a little too high for my comfort.

I agree that those buds aren't ready. You want the white pistils to turn red/brown and shrivel back into the bud. Watch the calyxes swell up and you're colas may start leaning from the weight once they fatten up. The plant usually stops drinking as much at the end too.

Gnatrol, yellow stickies and alternate bottom feeding with top feeding. If you have a lot of fliers, whack the containers to stir them up then suck them out of the air with a shop vac.

I was replying to post #13 from severed tongue. He posted a photo of mature plants and one looks like a male. I was just making sure he knew.

You do see the male parts on the plant on the left side though, right? That wasn't a joke or insult, I see balls too.

I'm away so I can't look at the bags but I think they are a mesh. The 90 and 120 were very close in quality but you'll get a little more yield from the 120.

I have a set of 8 bubble bags and found that the 90 and 120 microns work well. I tried a 180 and it's too green for us but fine to throw in a cookie recipe. The 73 didn't yield much but the 90 and 120 were a nice blond color and not much difference between the two.

Your grow looks healthy and you should have a nice yield. Make sure you don't harvest too early. You can have a healthy grow but end up lowering your yield by chopping early. Be patient and ask for opinions when they're closer to harvest. You'll get different opinions on removing fan leaves...

Some strains don't double in size, and some strains take longer to complete the stretch. I had a super skunk that barely stretched for about 18 days, then doubled in the next 8 days.

Like others have said, that's a lot of frost for early flower. You're on your way to some nice buds. I'd recommend getting "is it ready yet" opinions before harvest. It's very common to see plants harvested too early. Harvest too early and you'll lose the medicinal benefits of cannabis.

I've used Gnatrol every 7-10 days and it worked. Mosquito bits or anything with bti in it is the same stuff.

When I zoom in on the leaves I see lots of white specks on some of them. That can be insects so try checking under the leaves with a loupe or magnifying glass.

Make sure you're PH is good too. PH affects how well a plant can uptake nutrients.

Rurumo has you covered, back off the N and be careful not too over water. If you're in soil, let the medium dry out until the pots are nice and light. Do I see oak leaves in your pots? I wouldn't use them because I'd be afraid of degrading organic matter attracting bugs.