Mmmm almost 2 weeks into flower with the jacky white and the light rail has certainly made them grow but they are now that big and spead that it takes ages for the light to reach one end to the other as a result there is a lot of stems that are leggy reaching for the light so i went out and brought another 600 hps so theve now got 2 600s phew you can see the meter whizzing round (hope it does not bring me on top) so my findings so far are light rails work very well but i would only recommend them for vegging but then its early days . next time i will probly rearrange my lighting system and run both lights on the rail