Comment by mkarliner
Interesting, I'll have to think about that. Actually, with rare earth paints, the big issue is persistence, which is rather too long. In the current script, I only turn the drum 1/4 turn, so it takes roughly 4 minutes to illuminate the same patch again. Otherwise the lowest digit tends to be blurred because it is a combination of the last two values.
Have you tried 360nm LED? The higher orbitals drop faster or so I've been told.