Lighting Questions

[texasfootball21]

I need to replace the bulbs on my 24 inch dual bulb T-5 fixture. I noticed when ordering the antinic bulb that some were labeled as 420 nm and some were labeled as 460 nm. What is the difference and which is better for growing soft corals?

Another question: Can you just use a desk lamp as a refugium light? If so, what bulb do you need?

[Submariner]

I used to use a "daylight" 26w (100w eq) cf light bulb from Walmart on a bendable desk lamp. I was the coiled fluorescent type that replaces a standard light bulb and it worked great. Chaeto grew like crazy and the live rock grew coraline nicely. I now use a small cf light because it fits my fuge better and someone gave it to me, plus it never falls over..

[CoryDude]

IMO, go with the 420nm. They seem, to me anyways, more of an actual UV actinic while the 460's are more of a deep blue. Here's a good discussion I found on your question on reefsantuary:

http://www.reefsanctuary.com/forums/general-reef-aquarium-discussion/4076-actinic-03-420nm-vs-460nm.html