Hi, I was wondering how does the plant know how many other plants are in the tent.
E.g say I have 20 plants under a 600w bulb and every plant is fully exposed to the light why wouldn’t they grow as well as say 5 plants under a 600w light.
Sorry to sound dumb, I tried searching but couldn’t figure out what to actually search for 
It’s not watt per plant. It’s watt per sqft. 5 plants take up less space than 6.
Hypothetically you could if all 20 plants had equal coverage. Let me know when you find a light that does that and can penetrate a canopy of 20 plants.
So if it’s per sqft, as long as all the plants are getting light they would all grow the same until they outgrew the area the light covers.?
With 5 plants, the one farthermost from the light will be closer than the farthermost plant of 20. In other words, you can bunch 5 plants in a smaller area (under the light) than you can bunch 20 plants.
The ones closer to the center of the light will likely outperform the ones on the outer edges due to the intensity falling off the further from center you get.
My light has a 2x2 footprint for flowering, so light seems bright in my whole closet but only a 2square gets full benefits of light, outside of 2x2 light diminishes for light hungry plants, lights have limitations
Sorry I meant to ask, how big of a room? And one 600w light? LED or bulb?
It was just a hyperthetical question, for future reference that’s all,
I have a grow at the moment and the seedlings were under 250w (all in small pots getting light) and they were growing very slowly, iv upped the light to 400w and they are coming on nicely now.
Seedlings take a pause to develop a good root system, then boom they take off lol… Happy growing
Every relevant metric in regards to horticulture lighting will ultimately come down to your ppfd average. That’s how much radiometric light energy over the size of your canopy in square meters. How much power it takes to get there won’t matter, as some fixtures are way better at turning a watt into light within the par region. Plant count doesn’t matter as 1 plant can easily take up the same amount of space as 25 plants. This graph is a good baseline of target ppfd average for your space based on traditional 18 hour veg and 12 hour flower light schedules.
