Hi Mark:

Do you have a web page on the LED analyzer/integrating sphere?

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html

Mark Sims wrote:
I would probably use green or yellow LEDs,  but the white ones should not be a 
problem.
  I built an LED analyzer/integrating sphere and one of the features is a 
circuit that optically measures the LED driver PWM frequency.  It can also 
detect the minute variance in LED intensity from an LED driven by a 950 kHz 
boost converter.  It also had no problems with a white LED driven at 4 MHz from 
a signal generator.  You see the long persistence phosphors mainly in large 
lighting LEDs and not in small indicator LEDs.                                  
   
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