The guys who did Fourknocks did use a concrete bowl that looks really ugly when lit up but in the gloom its not noticeable, the small shafts angled to light up the best carvings are pure genius though! http://www.themodernantiquarian.com/post/40927/images/fourknocks.html

It's a much better job than at Knockmany http://www.themodernantiquarian.com/post/44543/images/knockmany.html

Some of the unique carvings at Loughcrew are probably seeing their last century out .