How to distinguish between LEDs

Thread Starter

gabrieldesloz

Joined May 9, 2016
1
Hello,

I want to know what kind of tests can be done to distinguish between two leds of the same color, but with different characteristics (like luminous flux, for example).


Thank you.
 

mcgyvr

Joined Oct 15, 2009
5,394
What are you trying to do?
For luminous flux you would power both LEDs with the same fixed current and measure which is brighter..

When powered you can also determine the forward voltage rating of each by measuring the drop across the LED..
 

#12

Joined Nov 30, 2010
18,167
When I needed a measurement of light intensity, I used a Minolta SLR camera.
I had to weasel my way through some references to translate F-stops into lumens, but it's possible.
On the other hand, you can probably get a light meter a lot cheaper than buying a whole camera.:D
 

ScottWang

Joined Aug 23, 2012
6,843
If you want to get a more accurate value of Luminous Flux then you can buy the Luminous Flux Meter, or you just want to do a general judge not that accurate, you can using a LDR + voltage divider + op amp positive amplifier.
 

wayneh

Joined Sep 9, 2010
16,128
Put all your test LEDs in series with a current-limiting resistor. They'll all have the identical current. Then just look at them.
 
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