Thanks all.

--Kurt



Add Homonym wrote:
KurtG wrote:

Which is the better bulb? Do corals, algae, etc respond better to
blue light?

--Kurt

Slightly, yes.

generally, i'd go with the 10K if you are supplementing with t5 of CF
actinics. Otherwise go with a 20K.

Problem is, 20K from one manufacturer is NOT going to be the same
spectrum as a 20K from another manufacturer.