Man, you guys are learning too much!
You can grow
all the way through with,
Flourescent, tubes or CFL
or
Mercury Vapor
or
Metal Halide
or
High Pressure Sodium
each will work by itself!
It's just that there may be some slight differences when using only one spectrum, so to be optimal, we sometimes use the cool for veg and the warm for flowering.
Certainly, if you want to use only 1 all the way, HPS is your best choice.
HTH
![Mr. Green :mrgreen: :mrgreen:](/styles/smilies/icon_mrgreen.gif)