"Once the reference level is established, the light level will very slowly decrease for about 5 hours, then it will stabilise its output at that level and not get any dimmer for the rest of the night."
Also,
"General Information > How long does a panel take to learn what its new light output level should be?
If the panels have had NO reference light for:
30 mins in darkness = 0.5 sec of the reference light
1 hour in darkness = 2 sec of reference light
2 hours in darkness = 10 sec of reference light
3 months in darkness = 10 minutes of reference light"
(from their website)
Reading through the lines, they look like glorified GITD sheets! No "reference light" to me sounds like "no light to charge them up." If I take a GITD sheet and leave it in a drawer for three months, it may still be glowing, but very, very slightly. My gut feeling is that these are simply a more concentrated or more advanced version of GITD technology which is charged from light. Brighter source light----> more powerful glow.
Good catch on that keyring, as I didn't see it before. With a keyring that both sits in a bag and perhaps rests on a table under overhead lighting between uses, it would probably function very well.
Again, to me the primary barrier is cost. I don't suppose they have a 50% CPF discount! :crackup: