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LIGHT-EMITTING DIODE (LED). A PN-junction diode that emits visible light when it is forward biased. LEDs are solid-state semiconductor light sources, LED Manufacturers.
Depending on the material used to make the diode, the light may be red, green, or amber, [LED Semiconductor Material vs. LED Color].
LEDs may be uni-color, bi-color, or tri-color, in either through-hole or a Surface Mound Device [SMD]. Standard sizes for thru-hole [radial] devices are T-1 [3mm] and T-1 3/4 [5mm]. Round lens Sizes; 3mm, 5mm, 8mm, 10mm, 20mm; Rectangular lens size; 2x5x7mm; OVAL sizes; 4mm, 5mm.
The Cathode is the short lead, and the Anode is long lead [positive part of circuit] for thru-hole devices
