homebrew vactrols

[jorgen.bergfors at idg.se]

>...exactly, what I wonder is whether the material itself is everywhere equally likely to respond to a particular photon.

What I wonder is if it is important to evenly illuminate the entire surface of the cell.
In my experiments, a narrow beam LED worked best, so maybe this doesn't matter much. My LED had the lens just a millimeter or so from the cell surface, so it can't have been very evenly illuminated.

/Jorgen