How to measure lumen with camera

[danneR]

Hi!

I have two cree leds that I need to compare. One should me more effective than the other, but my eyes can not see any difference.

So my plan is to measure the lumens of them.

There must be a way to compare the LEDs by using a digital SLR camera? I can just no find out how. Did some searches in this forum but with no success. Anyone that can help me?

Cheers Daniel

 

[Entrope]

(Post Removed)

 

[danneR]

Thanks. One of my problem is that one LED is mounted in my lamp, and one is bare. So the reflections are not the same.