Problem with lumens...

So I try to figure out how much lumens do I need for my grow room... I think I don't count something correct. I have 6 square mater grow room for 5 plants. So 6 square meters will be 65 square ft. I read that I need 5000 lumens per square feet. So it will bee 320 000 lumens per 65 sq/ft. So I have 250W HPS which is producing about 29000 lumens, so in fact for this small room I need 11x250W HPS, so in fact I need 2750W light... wtf????

How much lumens do 1 plant need? In my situation it looks like that if I will put 5000 per sq/ft then each of my plants will have 64 000 lumens

Previous year I got the same light and 3x CFL each 23W 2700K with 1350lumens each... This year I got little bit bigger grow room and I add 3 more same CFL's...

I can try to make my room smaller, like 50 sq/ft, but still it will look unreal to put 5000 lumens per sq/ft...

Now I have about 36 000 lumens, each plant have ~7000 lumens...!

So maybe someone can help me with some correct information?

I don't feel like doing any math, but light bleaching occurs at 10k or so the sun averages 7k or so, that's what you wanna shoot for. And they need 2100 to sustain photosynthesis.. average 600 watt hps throws 90k good for a 3x3 area. Its rated at 1 foot. Too close and you'll bleach.. roughly 8inches......hope that helps

Slightly more in depth ... bleaching happens when the chlorophyll can't handle the amount of light your trying to give regardless of temp, it happens over 10,000 lumens per sqft, all plants are different though sativas handle better in general than indica. The leaves turn yellow even white and the plant doesn't grow as fast. Some like to say lux is better but according to google 1 lumen (per square foot) is equal too 10.7369104lux...the sun under perfect conditions is about 120,000 lux which is the most plants have adapted too. That equates to about 10,000 lumens per sqft but not consistently..likewise 2100 lumens is required to sustain photosynthesis......just a copy and past of my answer in another thread

It has more to do with the footprint of your grow. I doubt you are going to pack the entire room with plants, more like a 4x4 area I would think, in which case a 1000 watt fixture plus 2- 250's would be optimum. A good 1000 w bulb will produce about 120,000 lumens, and 250's produce 20000 plus. That will give you 160,000 lumens which is fine for a 5x5 area, or very good for a 4x4 area. Figure out your exact grow area and take it from there. I would get a 1000w fixture, and add additional lights like your 250's as needed. Hope I have helped.

~39" = 1 meter= ~3.25 feet

6 square m = ~ 6 sft ( ~ 3 x 2= 6 whatever) not 65 sft

If you meant 6 msq = 6 x 6 =36 s meters = ~ 36.5 sft

I am lighting a 2 x 4 tent with ~ 110 led watts (~ 90 lumens/watt) using 4 led tubes @ 20w + a few led globes for below canopy

Almost ready to harvest see my thread,