Laserdoc, I have that exact same unit. Although I cannot directly answer your questions, in the instructions it said that on overcast days the sunscreens are not needed, and also if used inside a shooting range a strong light could be used to make it work effectively.
I imagine it would work in about any situation, but may take some modification. BTW it's a fine little unit-even holds up well under fire! (I shot one of the screen posts a few weeks back. Bent it back into shape, kept going)