For cheaper lighting, get ordinary household bulbs (I recommend screw fitting instead of bayonet caps) in daylight which are just T5 bulbs for the house and they have a built in starter etc
I got mine from
HERE at about £6 each then wired them in for a few quid. I think 50 watts of light cost about £18 including wire, plug and bulb holders.
WARNING: Do not allow them near water or condensation, mine sit nicely over condensation trays to prevent them getting wet.
With the floss used in filters, the like of Juwel recommend they are thrown away weekly, well if you are throwing it why not just rinse it under the tap, obviously it will kill some if not all bacteria contained in there, but no more than putting them in the bin will

The Juwel ones will take about 10 good blasts under the tap.
Also don't replace your sponges in your filter unless they are falling apart. If it is severley clagged up, and rinsing and squeezing it in old tank water isn't clearing it, again, use the pressure of the tap to blast it clean, again all the bacteria you lose doing this would have been lost in the bin anyway
Make your own moonlights, there are plenty of instructions in the DIY section, but basically you can get a twin set of 12" blue cold cathode bulbs for about £6 delivered from ebuyer and a variable voltage adapter for a few quid off fleabay (I paid about £20 inc postage for 6) then it's simple to wire them and costs about £8-£9 which is about half what you pay for them even through fleabay.
Arfie