# HSV gives varying brightness

**URL:** <https://forum.electromage.com/t/hsv-gives-varying-brightness/1230>\
**Category:** Patterns and Code\
**Created:** [May 13, 2021, 1:53am UTC](https://forum.electromage.com/t/hsv-gives-varying-brightness/1230 "2021-05-13T01:53:34Z")\
**Posts on this page:** 1\
**Showing post:** 15

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**Author:** ![jeff](https://forum.electromage.com/user_avatar/forum.electromage.com/jeff/32/3473_2.png) [@jeff](https://forum.electromage.com/u/jeff)\
**Post date:** [May 14, 2021, 4:55am UTC](https://forum.electromage.com/t/hsv-gives-varying-brightness/1230/15 "2021-05-14T04:55:56Z")

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Nick, thanks for porting that!

While we are discussing this (I too have been chasing this with the somewhat disappointing [implementation of HSLuv](https://forum.electromage.com/t/code-for-task-5-rainbow-codenections/1042)), I was wondering -

Does anybody know - Is there a \<$100 solution to color calibrate for a given RGB LED? For example, are there individual LEDs with reliable reference specs that we can use as a spectrometer to plot a curve for whatever cheap WS281X we just bought 1000 of?

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