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LEDs tend to be used in one of two ways: either for indication or illumination.
Indicator LEDs are low power, cheap LEDs that don't emit much light. For example, LEDs used to indicate that power is plugged in, or that a battery is charged. You can use high output LEDs and put less current through them (by using a larger series resistor)
Illumination LEDs are high power, more expensive and can be used to actually light something up. For example, LED headlamps, bike lights, christmas tree lights, etc.
|Diffused Red Dim (~10 mcd)||LITE-ON LTL-1CHE||Digikey Jameco Mouser|
|"||Diffused Red Dim (~20 mcd)||Kingbright WP7104LSRD||Digikey|
|"||Diffused Red Bright (~150mcd)||Kingbright WP7104SRD/D||Digkey|
|"||Diffused Red Bright (~150mcd)||LITE-ON LTL-4266N||Mouser|
|Diffused green dim (20mcd)||Kingbright WP7104GD||Mouser|
|"||Diffused green medium (40mcd)||Kingbright WP7104GSD||Mouser|
| Narrow beam (20deg) IR 940nm |
These have a blue-ish tint.
| Wider beam (40deg) IR 940nm |
|Standard LED - Through Hole RGB 630/525/465nm 750/420/750mcd 60Deg||WP154A4SUREQBFZGC||Mouser|
|Standard LED - Through Hole RGB diffused||WP154A4SUREQBFZGC||Mouser|
|Diffused RGB (tri-color) 10mm LED - Common Anode||BL-L515||adafruit|