So, I got there in the end. I used two 100W compact fluorescents from Megaman, 6500k. I used two metal shades that I found on ebay and fabbed up the fittings, hung down from the ceiling.
The pipework I put in, perspex, is now getting dirty unfortunately and I didn't think to put in any breaks - hence it is now impossible to clean. So, I am going to have to cut some joins into it in due course.
I'm also still having problems with the carpet plants, which I think is down to bad flow - I'm going to have to keep working on that which I can do when I redo my pipework.
Ta da!
Things still to do:
1. I'm using a Jewel powerhead to get extra flow - It's really noisy and I'm not convinced I need it if I can reposition the flow from my two external filters - Needs some more work and thought.
2. Need to get the carpet plants going better - totally lame coverage at the moment - think this relates to point 1.
3. Need to put breaks into the perspex tubes for the filter because they are currently getting dirty and I can't clean them - duh.
4. Need to tidy up the silicon job round the edge of the tank - I can't really be bothered to do this though and it doesn't look too bad.