Yeah, cold cathod tubes are used inside computer cases, for computer nerds such as me. They also have sound sensitive ones that beat to sound, though their application for aquariums are limited.
If you click on the more... next to the deluxe kit, it describes that it includes. I'll copy it here to save you time(this is for the blue tube):
PCI Switch Plate (see picture). No Cutting Required Jam Nut Switch Still Available Separately, see below.
Boxed Inverter The boxed inverter improves safety and provides for a nice finished OEM look.
Endcubes Top Quality Finish is a number one priority here at PcMods. The endcubes that we utilize provide an excellent mounting surface. It looks great and is functional too.
Velcro fasteners Don't use double face tape to hold on your cathode - use velcro to make it easier to remove it when needed.
To dim, you would need to get a variable AC/DC adapter where you could adjust voltage, and you would need to cut the wires to the molex connector and attach them to the adpater. That should be it.
Just keep in mind, a one color spectrum is hard to view your fish. You might want to get another red cathod tube. The advantage is that these can be dimmed, but LEDs are cheaper if you get them online(ask them to just stick them into an envelope, instead of UPS or Fedexing it)and consume less power.
20G heavily planted tank with Eco Complete
Pressurized CO2, Eheim Ecco 2236, 1 55W and 1 36W bulb