Thanks for the comments. Can I get any links for further research? I have a background in electronic engineering so I don't expect any trouble understanding what I read, my main stumbling point at the moment is literally not knowing what is available out there. I did look at single LEDs and strips about a year ago but decided to go for CFL's. I am expecting to be able to get single LEDs (individual or or on a strip) that I can mount with a good thermal contact to the metal walls. Everything is already properly earthed as I have CFL's in there running at mains.
Thanks