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Led silicon diode graph

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EDFG

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Hello,
What this mean led work as linearly?
And there is 20 red led in series at 20mA
And 2 series red only at 20mA will brightness will vary of both?
 
Sorry I don't understand you question.
LEDs are "linear" in that current to light is linear. (1/2 the current = 1/2 the light)
Voltage is not linear.
 
I have listen led work linear as in optocoupler so it use IR led
Will linearty work with IR led too?
And
2nd there is 2 string of led
A. The led of red 2v are connted in serious of 5 with series current R which is passing 20mA fixed
B. There is 16 led of red only same at 20mA with Rseries .
So will it brightness will same in a and b?
 
I think the current to light is linear with any color. (IR) Some white LEDs are using phosphor to get white. So they are a little different.

A LED with 2omA will out put the same light if it is in a string of 5 or a string of 2 or only a single LED.
So the 5 LED string (20mA) will output 5 time the light of one LED (20mA). Assuming the LEDs are all pointing at the light meter.
 
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