IR Emitter - Regarding Angle of Half Intensity

[sakibnaz]

Hi.

I am doing a proximity project where I chooses Vishay IR Emitter.

https://www.vishay.com/ir-emitting-diodes/

I found a term "Angle of Half Intensity" which I need to understand for angle. My understanding is attached.

Please advise me if my understanding is right or wrong?

Thanks in advance.

 

[vicky001.iith]

Yeah it is absolutely correct..
Half Intensity refers to the viewing angle rating as specified by the LED manufacturer. This simply states that at X degrees the LED intensity will be ½ as intense as it would be at 0 degrees. Our high-brightness & high-contrast design allows the actual visible angle to be much larger than the ½ intensity angle.

 

[sakibnaz]

Thanks Vicky.

Regards.