New Light Meter; Extensive Tests with the Fabric.

The calorimeter I have with the best sensitivity is designed as a part of a laser power meter that is not very sensitive, so I could not find any charts that break down the output for calibration, but the results were extremely consistent, so it should work for my use.

Best guess... A microwatt of light in the 7mm diode outputs about one millivolt; give or take 10mW or 10mV.

The ambient light on my unlit porch from the streetlights tens of meters away and my neighbors' porch lights was between 25mV and 27mV, and the light back from the fabric within 2" of the source was about 100mV. The laser was 65mW (It is beyond the range of the sensor, so I need to split it up before I can measure it relative to the returning light).

3 targets at 10', 25' and 50'