Or you can go back to basics and build this reflective RGB sensor from an LED ... a photocell. The principle behind [TechMartian]’s approach is simplicity itself: shine different colored lights ...

BAHZ LED Post-Top Lights are IP65-rated with selectable kelvin 3K, 4K, 5K, and built-in photocell. Designed for reliability, affordability, and durability. The BAHZ range of LED fixtures offers ...