My tent is 32x32x5’ with 425w of timber cobs. The side lighting is 20w led for and additional 80w. The cobs aren’t at full power but I have a lux meter reading around 70k lux at 12 inches. Half way down the plant I’m at 40k lux. That’s sufficient light for the tent. I moved one plant out of the tent 5 days ago and she was at 34 inches so she’s grown 6 inches in 5 days. She is definitely lacking enough light but there’s only so much I can do. Got 4 more of the 20w led shop lights I might rig up around her. After that I’m tapped out on lights....
I don't put any much faith in lux meters, because the lumen is an artificial unit that is
heavily weighted towards the portion of the spectrum that the human eye / optic nerve / brain
perceives as being brighter. Which was great when such things were used as intended, e.g. designing and installing area lighting in a room that people will be in - but now, with some people trying to use it to determine any useful information about agricultural (use) lighting for the growing of plants... not so much. Your meter might be reading high because you have a good light - or because it is picking up on any green light which is present in the spectrum and scoring it WAY higher than other colors. Plants don't use a lot of green light (understatement). But there will be some present in most "non-discrete" light sources, IOW, ones other than the "mono" LEDs.
Nonetheless, a 425-watt COB setup will be okay in a 7.11111(∞) ft.
2 space (and. Although... You mentioned that you're not running it at full power. What wattage do you have it adjusted to? Growing an autoflowering strain, you'll be running your light 18 (or more) hours per day, so... You should be fine driving it at 308 to 342 watts, I expect. I am certainly no expert at this cannabis gardening thing, but my guess is that much more than that might even start to become counterproductive, unless you're adding supplemental CO
2 and maintaining lights-on temperature greater than 87°F. Or happen to be growing one of those (thin) 13-fingered leaf equatorial landrace sativas that evolved to thrive under constant, unrelenting sunlight all day long, every day, I suppose.
This is (to some extent) guesswork and supposition, lol.
Some strains just shoot for the sky, so to speak. 20+ years ago, I grew two phenotypes of Nevile's Haze for a while. One grew like what you'd expect from a 16-week flowering period sativa (which was... trying enough). The other one - my brother's lady called it Mindf*ck
- flowered for 20½ weeks, stretched for the first 58 days of that, and mature rooted clones, placed directly into the flowering room at 10-12 inches... would end up at around six feet tall. Second biggest RPITA strain I've ever grown. I miss it to this day, lol.
Definitely the tallest I’ve seen!
looking beautiful!
I bought it so I could see the small adjustments with my light the naked eye cannot pick up. Serves its purpose.
