Need a hand with lumen measurement

[MRsDNF]

Lots of info in this thread on mystery pipes.

Lumens measuring contraption... (or just a pipe dream?)

Wanted to throw this idea out to the experts, so please humor me if you will... Two things lacking from my reviews have been: - PWM readings (building audio cable connected to solar cell and will use a PC soundcard oscilloscope program - Lumens measurement. While I can do a ceiling bounce, there are usually too many factors introduced (beam shape/intensity chief amongst them) For the latter, I've been meaning to build an IS but don't like the idea that there would not be a stable platform/h…