OK, so not a good idea to mess with the timing, i can understand that. Of course, ENVIROLITES.. why didnt i think of that ? My local hydro shop sells em in blue and red, presumably blue is best for veging ?
I have tried veging under flourescents over the years, but the plants became quite stretched and spindly. My 600w on the 12 cycle runs on a light rail over 6 foot or so, but i agree that using the 2 600's would make for a better yeild.
Will rethink my growroom.
Thanks for info.

V.