# About Luminous Intensity of Unicorn HAT HD LED
**URL:** https://forums.pimoroni.com/t/about-luminous-intensity-of-unicorn-hat-hd-led/17509
**Category:** Support
**Created:** [July 16, 2021, 8:52am UTC](https://forums.pimoroni.com/t/about-luminous-intensity-of-unicorn-hat-hd-led/17509 "2021-07-16T08:52:07Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@SomeTang](https://forums.pimoroni.com/u/SomeTang)
#### Post date: [July 16, 2021, 8:52am UTC](https://forums.pimoroni.com/t/about-luminous-intensity-of-unicorn-hat-hd-led/17509/1 "2021-07-16T08:52:07Z")
Does the luminous intensity of leds of Unicorn HAT HD changes by angle? If so, how does it changes? This question is crucial for the project that we are doing.
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### Author:  [@alphanumeric](https://forums.pimoroni.com/u/alphanumeric)
#### Post date: [July 16, 2021, 10:30am UTC](https://forums.pimoroni.com/t/about-luminous-intensity-of-unicorn-hat-hd-led/17509/2 "2021-07-16T10:30:04Z")
Mine are behind the Black Ninja Diffusers, If the brightness decreases at side angles I can’t detect it just by looking at it.
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### Author:  [@Shoe](https://forums.pimoroni.com/u/Shoe)
#### Post date: [July 16, 2021, 12:08pm UTC](https://forums.pimoroni.com/t/about-luminous-intensity-of-unicorn-hat-hd-led/17509/3 "2021-07-16T12:08:59Z")
Often, but not always, the datasheet for an LED will have a diagram showing the change in luminous intensity with angle. I don’t know exactly which LEDs Pimoroni used, at a glance [this one](https://www.digikey.com/en/products/detail/cree-inc/CLMVB-FKA-CFHEHLCBB7A363/2809752) is the closest I can find, and the datasheet has diagrams on page 6 describing this.