Basic questions on CFL and color temp

[Volker]

ior the last time 3000k or close for flower only.

I disagree.

While the red portion of the spectrum is utilized for bud production, it is also still utilized for plant growth & chlorophyl activity as well. Witness the many, many growers who grow their whole cycle under HPS. The red portion does work for veg, as well as the blue prtion.

So, a single 42W 2700K CFL with an output of ~3000 lumens could - in theory - take a single plant all the way through its' life and produce a gram or 3.

In fact, my standard "rule of thumb" for plants during veg is one 27W CFL per plant. Let us not forget that CFLs are an entirely different ball game from old style flouros. What you can do with these tiny, standard screw-in bulbs is on a "whole "nutha level" than tube flouro.

Again, CFL will never replace HPS as the "tried & true" light of choice. But they are wonderful in specific situations.