64.56 -- Light-emitting diode (LED)

Light Emitting Diode (LED), Yellow, 5mm Standard High Quality, Diffuse — Eisco Labs

Temperature-dependent photoluminescent behavior of millimeter-scale Cs4PbBr6/CsPbBr3 bulk crystals and their application to white light-emitting diodes - ScienceDirect

64.63 -- NPN transistor switch

LightEmittingDiodes.org Chapter 1

PARAMETERS, Voltage: DC 2.0V-2.2V, Current: 20 mA, Anode: Longer Leg, Viewing Angle: 30 degree, Wavelength Range: 620-625nm., WIDE APPLICATION, These

Novelty Place 100 Pcs 5mm Red LED Diode Lights - [Ultra Bright] Clear Transparent DC 2V 20mA Emitting Diodes LEDs Bulb - DIY Science Project

Illuminate Your Space - LED Lighting Solutions

LED (light emitting diode)

CHANZON 100 pcs 5mm RGB Multicolor LED Diode Lights Common Cathode(Clear Round Transparent 3 Color) 4 pin Bright Lighting Bulb Lamps Electronics Components Indicator Light Emitting Diodes : Industrial & Scientific

Illuminate Your Space - LED Lighting Solutions

Temperature-dependent photoluminescent behavior of millimeter-scale Cs4PbBr6/CsPbBr3 bulk crystals and their application to white light-emitting diodes - ScienceDirect