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I prefer to run perpetual if you have a separate veg area. In a 3x3, I'd have 1 Plant ready to harvest, 1 2 weeks away from harvest, 1 4 weeks from harvest and 1 that's 2 weeks into flower. As soon as 1 goes, another replaces it. Much more efficient use of space, plus you'd get a plant every 2...

Enough negative pressure*

I agree that your plant count might be a bit high. 3x3 holds 4 nice sized ladies. Also, the air intake can be passive. The intake fans could potentially pressurize the tent and leak dank air. A 6 inch fan is more than capable of pulling air in passively. Just my $0.02

Are you looking at the same drive currents? Unless there is a new version of something, I would have put huge money that they were the same. Maybe I'm too high.

I go through about 3 grams a day. My girl does maybe 1.

Growmau5 has a YouTube video that is great. Google Growmau5 heatsink video.

I buy mine from digikey, they're right down the street from me though. Big cheap heatsinks can be found on ebay sometimes. It takes some calculations but it can pay off.

If I remember correctly, it's something like 53-54% efficiency and I have 272 total watts. It's been a while since i ran the numbers. I have a cheap light meter that I used to check the variance. I'm sure it's not accurate to the real world, but accurate enough to see if I have hot spots. 8 V22s...

Strain dependant for nugs size, but they're all nice and tight. I'm very satisfied with the low amp perimeter lighting.

4 300ma v18s on the small bars on each end and 700ma v22s along the sides on the bigger sinks. The wiring is a mess in the pics, it was a trial run before I cleaned it all up. Less than 5% variance in light levels across the whole canopy.

Bridgelux V series. The v22 is the same as a Vero 29 with no mounting holes and about half the price.

Some poor pics

I have 16 cobs as perimeter lighting, nothing in the middle and the lighting is even to within 5% at the canopy. I'd move the 4 bigger cobs out further towards the corners.

+1 on that. I think a major advantage of LED is the option to create a much more evenly lit canopy. I have a 30x36 cabinet with 16 cobs as perimeter lighting and nothing in the middle. My light levels vary less than 5% across the entire canopy. No way you can get that with a single bulb.

I'll be doing a side by side of the 550 vs my own COBs. I have 8 V22s at 700ma and 8 v18s at 300ma for a total of 272 watts in a 30x36 cabinet. I'll post a new thread as soon as I get the 550.

I don't even pay attention to veg times, whenever they're big enough to go into the flowering cabinet. Low light intensity will help make them stretch in veg.

Your supersoil should be a stand alone that needs no supplements at all. If you are top dressing, don't use supersoil, use earth worm castings.

Is this your first grow?

Why don't you use the V22 chips? The same performance for less $

1 day at 12/12 isn't enough to trigger flowering. Your ladies would look at that like 1 cloudy day.