Brilliant cheers foxfish. I'll go and have a look round for some blues and reds.
I was thinking 3 rails of 3. Not really sure if that would be enough without seeing them in place though. If I put too many in I can always just remove a bulb, so I'm probably better going for 3x4 or even 3x5. I can always use a dimmer as well.
I'll have a sit down in a minute and work out what's what, see where I can squeeze a few colours in. How many do you reckon?
Cheers
Edit: Will a couple of red/blue combined work ok? Like the LED grow lights you can buy?