Thanks for the reply alto.
I did look at those LED lights on CO2Art website earlier, but couldn't make sense of the information on there? I couldn't work out how they are fitted to the aquarium e.g. brackets, as hanging pendants, what their dimensions are etc. I think I worked out that you choose the model based on the depth/height of the aquarium you've got, so that the light penetrates all the way down to the substrate, but other than that, I'm completely lost. I should really contact Miroslav and see if he can help at all.
If I could see a picture of one of them set up on an aquarium that would most probably help me decide if it's what I'm after or not.
What I was actually looking for was feedback from users of the Fluval light, as I have been having seriously problems with the reliability of these units. I've tried searching the web, but I haven't really found any useful reviews of this product. I was hoping someone on here had been using them, so that I can see if my situation is unique or a general problem with the light strip.