Okay THG i was stupid!
I did a miss calculation about my lighted areas.
Im converted badly im sorry...
My area wich contains 30 plants and 2x 600w hps is 7,9ft x 4,6ft.
Its about 36 sq ft for 2 600w hps.
I assume this is much better :))
I decided to go with air cooled hoods till i buy my led...