to be honest we were all suprised !
the lights were positioned about 40 cm above the plants
they used top hydroponics .... it was a top set up , only relay practicle for maybe 4 plants at most ! bust they grew huge - they are on another forum - i wil try to post links !

anyways work is on the way and im stil confused if maybe i should buy one 250 and a 400 and fit it on the rail !