Critter: Thanks, I'll look through your link.<p>
SuiJuris: Yeah, I'm watching the male patches plenty well each day - my tendency at the moment is to let them grow out as much as I can because I'm really curious about this event, it's so peculiar, especially on the feminized plants. But I think tomorrow I'll pinch the largest male buds, they look fairly close to pollination. I'm wondering if the problem will peak soon and then go away now that the HID is back for a while, at least that's my hope. The female buds are still growing well anyway, so this isn't a major disaster so far. It's only a problem, as you say, that I have to be careful unless I want a bunch of weird seeds that might grow who knows what?? :-)<p>
As to the lighting, the HID is 1000W halide Warm Deluxe (adds red spectrum) vs. the VHO's 110W. I guess it's possible the changes HID-to-VHO-to-HID triggered a stress reaction. I'm no expert, but I have a lot of reference material and I've never read/heard of this cause for stress and sex-switching on well-developed females, and I can see you're pretty well versed on growing, too, and haven't heard of it either. It's pretty bizarre though, isn't it?<p>
The only other possibility I can think of is nutrients - I've been experimenting a little using an extra "P" 15-60-15 for budding, though keeping the doses fairly light. I can't rule that out entirely, as I haven't tried P that potent before...I may know for sure if I continue the nutrient but maintain the HID, and the problem goes away soon.