Recent content by blueX

I dont see the problem with my question. I mixed things up a bit with light intensity, fc, distance an so on when trying to use things together. It was wrong and i knew it - THIS IS WAY I OPENED THIS THREAD. Im not the only one here who confused things and from there came misunderstanding. Im...

I did understand the equation - i even did the same thing at the start of the post. I just didnt understand the distance factor in the equation but now i do.

Thx a lot that's exactly what i wanted . Only one thing - can you tell me how you calculate the furthest part away from the bulb ? Its been a long time since my last math lesson :) Anyway TeaTreeOil thx a lot for your help too. I learned some things from you too .

In your equation you dont include the distance from the bulb to the canopy and it does make a different(or i just dont understand the "3.59 feet away from the bulb" thing). I the distance is 1f(12i) or 1.5f(18i), how does things change? Can you show me ? Sorry im pain in the a$$ but i realy...

I meant average. I want the light intensity to be 7K per sf at the canopy.

Im still VERY confused. A lot of people here are saing different things. This is way i want to know the math behind what you say so ill know everything is correct . Lets say i have: 4'*8' grow space, i use 600w hsp's(~90K lumens each), 1.5f distance between the bulb and the canopy and i want to...

I know those charts. According to it a 600w hsp give only 13K lumens per sf at 1f(18i) distance. It means that it can only cover 1.85 sf area at 7K lumens per sf - there is no way for that . Maybe i dont understand things right ?

Well if so my math was correct ? In order to give my plants 7K lumens per sf on the canopy(=fc) i need 600w hsp on every ~5.7 sf area (see the calculation above)?

But again, there is the distance thing. The sun gives 10k lumens per sf on the ground. 90K lumens are from the bulb - and the distance is a key factor. Any good mathematician here ? :)

Oh ok. I thought it was a problem with lumens and fc analogy. Anyway can you(or anyone) help me understand how to do the math correctly ? I dont trust any charts(since a lot of them are showing different things) and anyway i want to understand things better. How do i calculate how much SF(or SM...

I just cant get thing right mathematically, maybe someone can help me. If i put a lamp 1.5f above the canopy, according to the inverse square law a 600w HSP(~90K lumens) will make 40K FC(90000/1.5*1.5). If i want to have 7K lumens per SF it means that i need 600w HSP on every ~5.7 SF...

It is. I still want to be able to do the math right and i cant figure out what do i calculate wrong - if you can help me with that it will be greate(1 reply above). thx.

I still cant get things right(mathematically). If i put the lamp 1.5f above the canopy, according to the inverse square law a 600w HSP(~90K lumens) will make 40K FC(90000/1.5*1.5). If i want to have 7K lumens per SF it means that i need 600w HSP on every ~5.7 SF area(40000/7000). Its a lot more...

I already saw those charts but thx . I guess my question is if SOG method require diferent environment from regular grow ? Cause the plant go to flowering a lot earlyer therefore i guess the plant is weaker.

Still need help :\