Join Date: Oct 2009
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Ditto on the problems of measuring accurately. You also have to consider whether they have 3, 5, 7 or X elements and the color of the LED.
I have some 5 element amber blinkies as back up to the back up. They aren't extremely bright, but between the color, diffusion and blink pattern are quite noticeable. I know the type you are thinking of - the blue and white ones at DX are extremely small and weak. They are only good for parts for decent ones.
You might be better off trying to get photos of different ones at specified distances. Even then you'd have problems with different ambient light.