Pololu - T1-3/4 (5mm) RGB LED with Diffused Lens (5-pack)

These multi-color LEDs contain red, green, and blue (RGB) elements that can be mixed to produce different colors. The three color elements share a common anode and are encased in a diffused white lens that blends the colors and widens the viewing angle. This product is a pack of five (5) RGB LEDs.

Pololu - Addressable High-Density RGB 72-LED Strip, 5V, 0.5m (APA102C)

Pololu - LEDs

Pololu - RGB LED Satellite Module 001

Infrared LED

Teacher Resources Underwater Arduino Data Loggers

Teacher Resources Underwater Arduino Data Loggers

Addressable RGB 30-LED Strip, 5V, 1m (SK6812)

Pololu - Addressable RGB 8x32-LED Flexible Panel, 5V, 10mm Grid (SK9822)

Pololu - SparkFun Inventor's Kit - V3 (with Arduino-Compatible RedBoard)