JOLORNA: Project 1 is similar - though I was thinking of a bit bigger. Thanks for the link tho' have saved it & it will come in handy.
COVERGIRL (!): Yep -Project 2 is pretty similar,,,, but the ring will need to be 'square section' (I think) to run the LEDs on the inner face (difficult to explain with the picture ?!) I'm thinking of a ring about 12/14" diametre, with the LEDs facing towards the centre of the ring, for very close Macro work. I'll have a look for square section on google now i've seen these - thanks.
HOWARD: as above, now that i've seen a few in Google, I can try there,,,, tho' i'm not 100% certain what i'm looking for (for eg: I wouldn't have thought of looking for TORUS (even tho' I was born in May ?!)
Food for thought folks - many thanks
PS: If you know what I ought to be asking/looking for, I'd be pleased to hear about it !