Aire & Sun Power Systems is where we bought the solar panels for Weirdigans, and lots of other bits of useful solar kit too. Highly recommended.
Hob's Light Sculptures are surely the most beautiful thing you ever did see. All using LEDs. I am in awe.
If we all turned to LEDs for our lighting the UK could manage without 8 of its big power stations
Horsebox Renewables self-contained wind and solar power for hire - lighting too.
For non-LED but interesting sites have a look at: