Anyone expermenting with JTs and has an Arduino

[MileHigh]

Sorry to complicate matters.  I see that it's a LUX meter which is all about the human perception of brightness.  So it should work fine, I would just recommend doing some due diligence and test it at different flashing frequencies.  For example, you may perceive that an LED is the same brightness when flashing at 100 Hz or 12,000 Hz.  If the chip LUX meter shows you the same intensity also, then chances are you are in great shape.  Plus it must be fun to program and poll it with your Arduino.

[TinselKoala]

Well, MH has a valid point about the sensor that I use, anyway. How does it handle integration of the LED pulses from the JT? That's why it needs to be calibrated against not only the same LED driven by known DC power, but also against some other reliable measure of light power. If it reads "x watts/cm" looking at a steady DC light power level, are we sure that a pulsed light at the same actual average power will still read the same "x watts/cm"?

[Legalizeshemp420]

I agree.

What could be done is to set up the sensor in a tube with a LED on one end and the sensor on the other.  Now flash the LED and see what changes because something should change but will it change from 1k pulse and 12k pulses?  if the LUX doesn't change very much then it should be fine but if you were flashing 1hz then went to 1khz I expect the LUX to drastically change.

[MileHigh]

For reference for the curious:

The lux (symbol: lx) is the SI unit of illuminance and luminous emittance, measuring luminous flux per unit area. It is equal to one lumen per square metre. In photometry, this is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface. It is analogous to the radiometric unit watts per square metre, but with the power at each wavelength weighted according to the luminosity function, a standardized model of human visual brightness perception. In English, "lux" is used in both singular and plural.

[Legalizeshemp420]

Lux is a measure of intensity that is weighted against the human eye's sensitivity.  If you look around the web, and read the datasheet, you will see that irradiance is approximately 1uW/cm2 per khz using TinselKoala's TSL235R setup.