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LED luminous intensity and angle of illumiation

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eem2am

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Please see this datasheet for a 3.7W White LED.

***DATASHEET FOR LUXEON III EMITTER LED

https://www.philipslumileds.com/pdfs/DS45.PDF

On page 14, you can see that although the LED emits light over a 180 degree angle, the intensity drops off as the angle increases.

Are there any White power LEDs that do not suffer such reduction of luminous intensity with angular displacement ?

That is, is there such thing as a white power LED which emits at equal intensity in all directions ? (obviously excluding behind the LED itself).
 

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pauloynski

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As far as I know there isn´t such a led. The viewing angle is dependent on the shape of the lens in front of the emitter.
 

Audioguru

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The Luxeon III has an angle of 100 degrees where its luminous intensity is half of its on-axis peak.

Your vision's response to brightness is logarithmic so half is only a small decrease.
 

eem2am

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thankyou paloynski and Audioguru

paloynski:-

do you believe it is possible to just make the lens shaped such that the LED emits equal intensity in all directions?
 

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