I've heard from a couple of experimenters who weren't getting good results with their ring lighting setups.
If the LED's shine directly thru the edge of the glass, there is a large loss due to absorption. Unless you use very high brightness LED's, the image will be faint and distorted. But you can use general purpose LEDS by leaving a space between the LED's and the cell (about 3-4mm), so a greater amount of light will pass thru.
That's the information that I was looking for. I've tried with a white LED strip, but I got no results, and I thought the LED strip might not be sufficient brightness or magnets are too weak. I already ordered a super bright led strip, that I think will make visible the magnet's lines of force.
Yes, I've made cells from many different materials. Acrylic works good, but not like glass does. There is a lack of detail when looking thru plastics, even with extremely flat surfaces. You can use a plastic bag and get the effect too!