Starting over with my tank!

Those are Power compact fluorecents (PC's). The wattage should be on the base, if not you can tell by the length. The blue is what's called an Actinic. You can buy them as 50/50's meaning half the light is daylight colored the other half is actinic. There are 2 base configureations, both with 4 pins each. One in a square arrangement the other with them all in a line.

They're OK, you can raise corals with them, I did for a few years. They tend to be hot compared to other fluorescents, even the T5 High Outputs, so have a short life span. And the available color spectrums is pretty limited. Best source I've found for them is www.ahsupply.com they also sell the best retrofit kits, with the best reflectors I've ever seen for PC's. I still use PC's over my freshwater plant tank.

Thanks Phil, I was wondering exactly what they were. Yeah, when I had my tank set up before the corals did fine, they were growing nicely. Thanks for the link also.

It is very important to ascertain is they are Square Pin or Straight Pin.

Square pin are configured like this - ::
Straight pin are configured like this - . . . .

They are somewhat fragile, so take your time removing them. Press apart the metal retaining clip on the bulb end, then lift the bulb upward slightly. This will assist in releasing the plastic end from the socket. The bulb and plastic end should come out as one piece, and then you'll see the pins I was describing.

Yeah, I have the square pins. I was going to post.."How do you take the bulbs out". haahhah But my wife got it. It's crazy that you can't change just one of the bulbs. oh well, hopefully my son will come today to bring me to the LFS, he came in from offshore last night. Thanks for the info Meley.