Man, my only question is why? It's so inferior to literally every other lighting system besides heat lamps, why spend months caring for something that could be so vastly improved with a very cheap and simple upgrade? T5HO, compact LED, CFL would be better even..
I've grown under incandescents, when I was 16.. It was inside a big speaker cabinet to hide it from my parents and it grew. I think i yielded a few grams of fluff., dont remember the exact yield, it was a looong time ago.
London bud, I have to say the more of your posts I read, the more I find it amusing that you are the guy who once told me I need to get my head out of the textbook and get some real life growing experience. But hey, regardless even though it's not YOU who is running this particular experiment, I give you kudos for not blindly following the trends and trying shit out for yourself. Many growers lack that openmindedness and get too wrapped up in their ego. so cheers to that.