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I have been looking around a few of those forums and it shocked me how they rate lighting, everything is about lumens. They say HPS and MH bulbs are better than fluorescent and their reasoning is that they throw out more lumens, but surely par is a better measurement than lumens?

Personally I have found this only happens with quite high lighting, with low lighting levels you get a better shimmer effect and its more pleasing to the eye colour wise.

Yes you could, you can get two 12w led bulbs for under £6 on ebay. Most people use a solenoid valve on their co2, when power is fed to it it allows gas through so you just hook it up to a timerand set it to come on a couple hours before your tank lights. How are you finding the filter?

The 13w unit should be more than enough, however if its the aesthetics that bothers you you could have a look around ikea or shops that sell indoor lighting and go from there, that way replacment bulbs are mega cheap are there are loads of different types to choose from, be it CFL or LED...

I would hang it just enough to get a decent visual spread, I would think you need a dimmer though.

Yeah, the ip64 or ip65 lamp holders should be used where the would be significant moisture levels, in a pendant however you should be ok. These are great to repair burnt out ballasts in luminaires or changing the luminaire from t8 to t5. I have thought about making a fixture, but for the price...

Ok after looking for a replacement ballast for my t5 luminaire I found some cool stuff for DIY'ers. Fluorescent Lamps Electronic Ballast with Lamp Socket 55W Fluorescent Lamps Electronic Ballast with Lamp Socket 24W All you need is some cable, a plug and a compact fluorescent bulb from lampspecs...

A good idea would be to get some par readings from various lights on various common sized tanks. Like the fluval 11w CFL compared to the tmc 400 ect ... Just an idea if you do get one :)

1x 36w bulb should be enough in my opinion.

Im putting together my 60x38x38 tank now and it came with an extemly low profile LED light (http://www.tankscape.co.uk/UP-PRO-Z-60c ... keyword=up ) I dont think this will be powerful enough or give as much light spread as I would like and it is attached to the rim of the tank which looks awful...

Also it may be worth noteing that those bulbs are quite expensive, have a look around on ebay for cheaper 12w led gu10's or even go for 10x 6w or 9w bulbs for a more even spread of light and to avoid spotlighting. You can also get dimmable led bulbs so that might be something to look into.