This is the most accurate response, as far as actual Intel goes. Plants use green light as a sort of tool, like a measuring tape, to see where the sun is hitting it to grow its branches accordingly. While it's effect on actual growth is minimal, it certainly does have an impact on how and where that growth occurs. Less green means more 'shade' to the plant, forcing it to stretch. Lollipop with only a few main colas? Probably no problem. Grow without training and you'll have all the small branches reaching for the light without adding any potential bud spots on the stem. More green essentially equals more growth spots.