LED intensity/angle mcd?
- From: wrongaddress@xxxxxxx
- Date: 17 May 2006 21:05:34 -0700
Looking at the specs for 3 red LEDs, I'm wondering which would be the
better choice for maximum brightness.
Allied part number 670-1257 which claims to be a 400mcd device with a
viewing angle of 60 degrees at 2x theta. Cost is 72 cents.
A second part 670-1224 claims to be a 1800mcd device with a viewing
angle of 30 degrees at 2x theta. Cost is 50 cents.
A third device is 670-1226 claims to be a 1200mcd device with viewing
angle of 30 degrees at 2x theta. Cost is 31 cents.
I'm not sure what 2x theta means, but I think if the angle is twice as
wide, the intensity should be 1/4 as much, so that a 1800mcd device at
30 degrees would be the same as a 450mcd device at 60 degrees?
Why would the the 400mcd device sell for 50% more than the 1800 mcd
device which has more total output?
Would the more expensive device be the better choice?
-Bill
.
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