I made a backlit sign for a friends distillery a year or so ago, and my approach was to keep everything inside the sign low voltage using LED strips. I had a 12v connection to CE & ROHS approved external driver and dimmer modules - bought from a UK supplier. No idea how that would stand up in court, but made sense to me!If anybody does make things like this and sells them I'd be interested to hear how they do it and cover themselves.