Technical

Electro-Optic Specifications (LED chips and packaged parts)

Visible Wavelengths (420 ~ 680 nm)
Term	Units		Description
Dominant Wavelength	nm	nanometre	Sometimes called the hue, the dominant wavelength is calculated from the CIE graph. It is the best specification to ensure colour repeatability between orders. Depending on the wavelength, tolerances of +- 2.5 nm and better can be guaranteed on low and high volume deliveries.
Intensity	mcd cd	millicandella 1 candella = 1 lm/sr.	Sometimes called the brightness, the intensity refers to the amount of visible power (lumens) emitted by an LED, into a given solid angle (steradian, sr). NB: 1 sr is equal to a solid angle of 65.5 degrees, a hemisphere has a solid angle of 2 π sr. Intensity values are the normal specification for comparing LED chip grades. However, for packaged LEDs, the beam angle has to be considered when comparing intensity. Eg, a LED chip producing an intensity of 100 mcd, can be packaged as a 300 mcd LED with a 5 degree beam angle, or packaged as a 50 mcd LED with a 100 degree beam angle.
Luminous Flux	lm	lumen	This is the total amount of visible power emitted by the LED. This value is becoming more important for LEDs as they are used as alternatives to incandescent and other traditional lights.
Non-Visible Wavelengths (350 ~ 400 and > 680 nm)
Term	Units		Description
Peak Wavelength	nm	nanometre
Radiant Intensity	mW/sr	milliwatts per steradian	A useful measure of how much radiation is being emitted in a particular direction. Particularly important for packaged LEDs, where the application needs a certain amount of radiation in a target area.
Radiant Flux	mW W	milliwatt watt	Also called the radiant power, this is the total amount of radiant power emitted by the LED. This can be measured in an integrating sphere, or with a calibrated photometer.

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