When looking for Opal at night, using UV light source, must be careful not to pick-up thing too quickly. scorpions "glow" like opal.
Using a radio receiver "tuned" to the power supply to the LED is what I alluded to in the original theory. It will produce a varying audio signaI, how to interpet that sound from the noise probably needs lots of field time or sophisticated signal analysis.
Any one heard from Max?
__________________
The simplest answer to a complex problem.... is invariably wrong! 
|