It is bs. The two bulbs have different spectrums, one is more blue, the other more red. Distance doesn't change the color of the light. If you use cfl's, make sure you put them close to the top of the plant 1-2 inches, just enough that it doesn't burn it.
well now, when the light is actually moving towards the plant, the Doppler Effect will , hold on...,
*cough cough* shift the light towards blue, and when moving away, wait minute...
*hack cough* um yeah, when moving away it wil shift towards red. the ideal solution is to run at nearly 5000 km/sec in a towards the plant for veg, and away for flowering, holding the light on the plants the whole time hang on,
* cough hack hack*aww man... im burnt, scientifically speaking.
and then there will be snacks.
i like to increase the size of the pot when the plant starts drying out and demanding water each day, then its up to a gallon, then 5 gallons, or the ground if needed. if you wait til the early stages of root binding you stress the plant a lot more, and slow down growth for a longer time.
as to veg time, you can force flowering right after the first true leaves develop, but most wait til node 4 or later has developed to flower, more nodes means more more buds, and a stronger root system to support them. people who use the sea or sceen of green methods flower many plants early to get maximum canopy and most effective light use. its a persona choice. im on my second month of veg and my plants have 6-7 nodes each with an average height of 20 inches last measurement, which was 4 days ago. im kinda worried about them, what if they got into the roundup, or are hanging out with tobacco plants. maybe i should put a cell phone in my grow room so i can check on em... shit now im getting paranoid and weird.