The higher kelvin grows more coraline algae, and the
corrals like it, and may grow better, but In my opinion,
I'd go with the 10k as it gives a more natural color. If
you want more actinic, ad vho actinic bulbs. Also the
higher kelvin bulbs darken up faster, and you loose useful
life of the bulbs faster. 10K is my preference. 14k looks
nice, and 20k is just too much. If all you wanted to grow
was coraline algae, then actinic would be the bulb of
choice :-)

Wayne Sallee
Wayne's Pets



KurtG wrote on 12/26/2006 12:10 PM:

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

--Kurt