good led comparison article

[jabel]

good article comparing spectra of several leds to mh.
Check it out
www.advancedaquarist.com/2012/3/aafeature

[rtalvarado]

This is what I was looking for Jeff, thanks!

[rayray]

Good article, here are the others in this series

www.advancedaquarist.com/2010/5/aafeature2

www.advancedaquarist.com/2012/1/aafeature

This article cautions against the use of too much red light.
www.advancedaquarist.com/2009/5/aafeature

It should be noted that even though there are measurable spectral differences in output, there should be correlation to which spectrum are useful in coral growth & health, not just appearance or differential pigment production.

[rtalvarado]

I wish he would have also included PAR readings in this article. Spectrum is good, but that really only measures the color of the light output rather than the intensity as well.

[rayray]

PAR info is offered in the articles i linked.

But PAR/intensity is a simpler issue than spectrum produced. Simply add more units, lower the lights, move coral up, etc. spectrum is inherent to the material used, electrical setup, age, etc.

Whats even more complex is the biology: what coral need in nature to thrive, and what we can get away with in our tanks.