One more question for you, Khy. (Always one more. )

I was considering PWM so that I could save power for seedlings and early veg and use one light throughout the grow. During mid-late veg and flowering, PWM would not be used.

Is this OK or is it better to use the light full power for the whole grow and just raise it high up in the early stages so as not to shock seedlings - or just use another light source altogether such as CFL for the first few weeks?

As my space is small, a one light solution is best for me at this time.

BTW, I have a commercial 120w (1w LEDs) tri-color unit. While construction is very nice, the lumen output seems insufficient even for my 2' * 2' grow space based on my last grow.