color chart

[sysco]

found this  thought i post it     RGB Color Codes Chart 🎨 (rapidtables.com)

[k6ccc]

That is a good start, but especially if you are trying to match some exact color, you MUST test on the lights that you will be using while they are mounted the way that they will be used.  The first part of that is critical - pixels are NOT consistent.   That includes different batches of the same pixels.  The second part may or may not be important depending on how they are mounted.  For example, if you pixels are against red brick, they will look different than if they are on a green house or stand alone in the yard.