maby i can answer my own question but not sure if this is right....

i got this off the light section...

2000 lumens sq. ft./21500 lumens sq. m. = Absolute minimum for growth. You won't get much from this, especially after the plant has grown a bit. Not really enough to flower well.

3000 lumens sq. ft./32250 lumens sq. m. = Pretty Good growth. Enough light for the entire light cycle, although your yields may be lower.
4000 lumens sq. ft./43000 lumens sq. m. = Very good growth. Once you pass around 3500, growth rate and ability goes up fast.

Over 5000 lumens sq. ft./53750 lumens sq. m. = Optimal growth. Dense growth in all stages.


and i figure 3500-4000 per plant is good enough for me

i wanted 2 600w hps lights giving out 30kper light

so ... thats 60k... 60k/16=3750k per plant + will have mylar around all walls and walls will be close 2 plants so light refelection should be good.. is this right?