Quote Originally Posted by thepaan
For the whole grow. Flowering is accomplished by changing the length of the night (long nights induce flowering in most cannabis strains).
I understand this, but are you saying the oft-quoted "more blue for veg; more red for flowering" is not correct?

Seems you have the 'metal halide for veg and HPS for flower' meme, and the latest 'one light (CMH or properly designed LED) for the whole grow.

Now, I am not sure how much the solar spectra changes (filtered through the atmosphere) from spring to fall - if in fact we are somewhat attempting to
mimic nature.

Just lots of conflicting 'information' floating around that I am seriously trying to grok.

Thanks for all your scientific references! :thumbsup: