Thanks very much. Glad it has inspired someone.
Regarding the lighting I use the Interpet Daylight Plus power compacts. These are rated at 36w and I think the colour temp is 6500k, it's a very clean white light.
The idea behind this was ADA use 2 of these dual tubes over their 60cm tanks so I wanted to have the same thing. It was either this or 150MH but i decided on the T5s because I didn't want to use MH on a small tank like mine and I was worried about the heat and power consumption. Over a 90cm tank you could probably use one ok. So T5's seemed to be the logical choice.
My issue with them is I have always wanted to use the 8000k ADA power compacts, because that colour temp is mean't to be brilliant, replicating a cloudy overcast sky which is if you think about it what you would have most of the time in the jungles and rainforests we take our inspiration from. Well I do anyway. So that's why I'm trying to find out how much the ADA lights are to buy. I think they'll be too expensive though.
I know what you mean though about the Arcadia lights. The ones they supply with their luminares looked bad to me, too pinkish. So I actually bought 4 Giesemann tubes, although they were OK I still didn't like the colour. Hence retrofitting my Arcadia 100cm Luminaire to a 60cm one with interpet T5's!! but that's another story.