Side glow type cable is often used for this. A carpenter creates a channel large enough to hold the cable against the glass edge. The channel could be painted white to reflect light back into the glass rather than absorb it. You should do all sides in a complete loop starting and ending at the light source for the most even effect. You might find help with design from the manufacturer. Most have someone on staff. Be careful with the light source selection as many have a fan and some are much noisier than others.

Here is a link that might be useful: One example of side glow

dim4fun,
Is that a fiber optic cable? It looks a lot like the edge lit version I found on a manufacturer's web site. The other brand had a channel that the cable fit into - I think you could just mount that channel into the frame, fit the cable into it and put the whole thing together. Fiber Strip Light & Track Bracket

I think it will come down to finding a craftsman/carpenter that is willing to work with the lighting as well as construct the window frame.

Thanks - at least it seems we're on the right track. ;-)
Anne

Right at the top of the linked page it says "Fiber Optic Cable". Do you want the entire piece of glass to glow evenly or do you want bright spots? The fitting you linked to is not what one would normally use to edge light glass evenly. The cable I linked to glows along its entire length. You would create a space in the frame for it so that the cable sits against the edge of the glass while the frame holds the glass. The light source needs to be close yet not direclty in the room so you don't hear the cooling fan.

Sounds like a fun project, woodswell. If you were closer to Ohio I'd offer to help you out.

Jon,
I wish there were someone in town I could really trust to do this - but the guy at the stained glass place I talked to seems to have a good grasp on what we want & need. He just has not done anything exactly like it before.

Here is the piece:

You see why I want to have it in a place of pride where I can look at it every day!

Anne

Here is a link that might be useful: Woodswell Blog

One thing that's occuring to me is that I wouldn't put the extra layer of glass on the inside. I would have one on the outside of the house to protect it from errant golf balls or whatever, but my instinct is that an extra layer of glass on the indoor side would hide a lot of its beauty, obscuring subtler surface textures and making it look as if it was in an aquarium. I'd also make sure the frame was constructed in such a way as to make the outer pane of glass easily removable, for maintenance purposes. Good luck!