50 Watts Per Square?

[Hands On]

If the Rule is 50 watts per square with a HPS ,…How would you know if your plants are getting the 50 watts, or more or less…I’m just thinking

 

[JWM2]

Divide area by total watts. So if you have 10 sqft (5’x2’) and 400 total watts (example) you have 40 Watts per foot average. Of course the closer you are to the light the more lumens the plant will get but it’s just an average figure.

 

[Hands On]

Divide area by total watts. So if you have 10 sqft (5’x2’) and 400 total watts (example) you have 40 Watts per foot average. Of course the closer you are to the light the more lumens the plant will get but it’s just an average figure.

That what i was thinking it was just an average

 

[hawkman]

there is a formula for that - can't remember it now - will get back to you . Need grow space size and power /kind of light

 

[PhatNuggz]

another of many dumb 'rules'

The measurement you want is 'umoles'

 

[hawkman]

LED's 60-65

 

[gwheels]

COB QB And STRIPS i think are closer to 40. 200 watts is as much as i would put in my 5 square foot and 550 to 600 max for a 4 x 4. I would go 450ish with a good spread but i find heat a pita to deal with when i pass 500

 

[Rootbound]

LED's 60-65

???? With good efficient "leds" 40 watts per square foot is overkill. 25-30 watts per square foot is what I run my quantum boards at in flower and less than that in veg.

 

[PhatNuggz]

LED's 60-65

your answer suggests that all leds are the same, which is FALSE

 

[Hands On]

They are not all the same