P4 Question

money

Newly Enlightened
Joined
May 30, 2005
Messages
21
I have been testing about 10 P4's, Ubin, SYN color that i have sourced from various places. I recieved one that is 20% brighter when i put it in my optic but when i test the lumens in a sphere the lumen output is not higher than any other sample i have. Can anyone explain it?
 

nerdgineer

Flashlight Enthusiast
Joined
May 7, 2004
Messages
2,778
Location
Southern California
You have access to a sphere?...:drool: You could be real popular around here.

As for why, it seems the only answer would be that the radiation pattern is different (different shape LED surface or sub-surface), probably more concentrated toward the front so it looks brighter but outputs less in other directions.

The eye is fooled but an IS is not.
 
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