I'm also curious about this, since one of our products uses the same sort of
LED.

But I'm also not sure I understand what you are asking... At what RATE is
the flickering? Are you talking about a rate that is slow enough for the
human eye to detect or at a rapid rate where they two colors blend (for a
person without color blindness) into a third color?

--
James.

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Vitaliy
Sent: Sunday, March 23, 2008 00:02
To: piclist
Subject: [EE] UI question that concerns the color blind

The "power" LED in some of our devices has three states: Red, Yellow (R+G), 
and Green. This proved to be rather useful for troubleshooting, although I 
understand that unfortunately, people with the most common form of color 
blindness can't tell the difference b/w R and G. Fortunately, this 
functionality is not critical, in fact in earlier revisions of this product 
the LED had only one state: green.

However, we are in the process of creating a wizard-style troubleshooter and

I have a question: would a color blind person be able to see a "flickering" 
LED, one that rapidly changed its state from R to Y? I assume the answer is 
"yes", since the brightness would change, and even a b/w camera should be 
able to "see" it, but I just want to get a confirmation from someone who 
knows for sure.

Vitaliy 

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