Andy,
Great idea , as usual. Not only does that show the glow but also the amount of degradation of the glow with time, Important info for fabbbers and consumers.
From experience, there is a superglow effect- first 20-30 minutes. Then it slowly declines over the next 8-10 hours.
BTW we made this in many colors. The first color we experimented with was the Halloween Green (I liked the powder blue we offer currently much better). I had a sheet in my bedroom in Vegas. Im a light sleeper, dont like light, noise, etc. I couldnt sleep with that sheet in the room. Id put on blinders (those eye patches) and wake up 4 hours later and the Lumistone was still glowing stong enough to break my sleep.
Finally I had to throw it in a closet to get my 40 winks. BTW photos never do it justice, its like me, or fabnet and needs to be experienced to be believed!
Although please listen to the advice Mr Gene has offerred, still tripod, slow exposure , long time, is the best way to photograph Lumistone. It mimics natural biological viewing conditions, i.e the rod receptors in the human eye.
Lenny