Great thread! I really like how clear you were in the original post. There have been a lot of great question and comments as well.
I'm wondering where I can get a cathode and how long are they? I'm doing a 30" light. I'm also wondering if cathodes can be added to existing strip lights. I have a 36" triple tube that's going on a 30L and when the light comes on it will be hard on the fish. I'm planning on putting a lamp on a timer neat the tank to ease them into the light but I'm thinking Cathrode may help too.
Thanks