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thanks for the great comments and input folks. and sorry i dont get much time to respond during the workweek. im up a bit early now, so i wanna update the lighting thing real quick.
im letting the light sit another day right where its at. i have about half dozen tops frying under light levels between 100-115k lux.
this morning ends the 2nd light cycle at these levels. the leaves on the center tops are all still nice and dark, the yellowing seen on them has not increased. edges slightly curled/yellow. veins yellow. but again, no increase in negative affects.
buds continue to swell, all have a brand new bud that by this morning are filling in over the new pistils they made. lower growth filling in much better now too. go figure, lol.
i do not believe at this point that the yellowing is caused by the lights. this is not bleaching. it smacks of high nute levels. the similarity of nute burned tips and the damage to leaf edges is pretty identical, and the leaves remain otherwise dark and healthy.
im theorizing that the high intensity of light is beneficial to the plants of this strain, depending on how much you feed them.
my ppms range 1200-1500 ppm over the week. this could explain how some folks can cram 1800-2000 ppm into this strain without frying them. i bet if i reduced my light back to 70k lux, i could do the same thing.
seems im getting more efficient feeding, using 25% less nutes than is possible, AND getting more light to my entire grow.
so, this will continue. if my theorizing is in the ball park, i should be able manipulate this way on other strains also, within thier own individual tolerances, of course.
light is priority 1. max the light. THEN max the nutes.
oh, one other note...
i have noticed thru these later stages that when the light first comes on, nearly ALL tops yellow substantially right away. after about 15-30 mins they darken right back up again and stay that way.
thats it. gotta get ready for work. happy humpday people!