Anyone expermenting with JTs and has an Arduino

[Legalizeshemp420]

BH1750FVI

Only around $2.65 and it is simply a LUX meter basically.  What you can do is use it to measure the brightness of your LED between your tweakings to see if you are getting more for less or not.

VERY valuable to have and really the only way to tell what is happening.

[TinselKoala]

That's pretty cool, it eliminates a major calibration/conversion issue with the sensor I used. I'll have to get this thing you recommend and experiment with it. The sensor I used gives a frequency output that's proportional to the light intensity, so you need to convert that to some power/area measurement in the Arduino code. It sounds like this BH1750 unit gives its output in lux directly.
http://www.youtube.com/watch?v=1Kzf7S-pOEM

[Legalizeshemp420]

It does and why I suggested it.  I am going to get the 2530, this, and I have the parts on order for the inductance meter.   I figure with that, and my 20mhz scope, I should be set.

[MileHigh]

I think there may be lots of issues so I would be cautious. It's an ambient light sensor so it all depends what you are trying to accomplish.  Are you trying to gauge the subjective perceived brightness of the LED and ignore the fact that it is flashing?  Then it might be okay but there are still lots of catches.  How does the sensor deal with flashing?   What about its spectral response, etc?

I am not trying to spoil the party.  It may well be the data from the sensor is reasonably in line with the subjective perception of the brightness of the LED by a person.  In that sense you are fine.  On the other hand if you are trying to use the light output of the JT as an indication of its electrical efficiency then it may be more complicated than things seem.

[Legalizeshemp420]

I think there may be lots of issues so I would be cautious. It's an ambient light sensor so it all depends what you are trying to accomplish.  Are you trying to gauge the subjective perceived brightness of the LED and ignore the fact that it is flashing?  Then it might be okay but there are still lots of catches.  How does the sensor deal with flashing?   What about its spectral response, etc?

I am not trying to spoil the party.  It may well be the data from the sensor is reasonably in line with the subjective perception of the brightness of the LED by a person.  In that sense you are fine.  On the other hand if you are trying to use the light output of the JT as an indication of its electrical efficiency then it may be more complicated than things seem.

All I am doing is replacing an expensive LUX meter that people already use to test these and with a simple device, and an Arduino, you can do the same.  It is a LUX meter so it will do what a standalone LUX meter does in the same situation.

We already know that a standard LUX meter sees the flashes and doesn't care so I hope this doesn't either.

Basically it is just a way to compare the same LED flashing and what it says the LUX is then you change something in the JT and retest the same LED to see the difference in LUX.

So, not an Apples to Oranges comparison just Apples to Apples with the Apples having been washed or not, a bite removed from it or not, etc...