I have a tendency to sacrifice my emergency chemlights for the entertainment of my friends' children. Now I need to buy new chemlights and I'll be darned if I don't have the best chemlights known to man. But how does one know if they are truly in the possession of man's best chemlights?
This little beauty will capture a reading of luminosity on the surface of a chemlight in a light tight box and log it until the chemlight is no longer luminizing. Chemlights perform differently at different temperatures, so temperature will be measured and controlled as well. Combine this with some other tests (length of light emitting section of chemlight, chemlight mass, durability of casing, etc) and you have the start of chemlight wisdom sufficient to make an informed purchasing decision.