# 17-27-050

LED

light emitting diode

solid-state device embodying a p-n junction, emitting incoherent optical radiation when excited by an electric current

Note 1 to entry: This definition is independent from the existence of enclosure(s) and of terminals.

Note 2 to entry: The output of an LED is a function of its physical construction, the material from which the LED is constructed and the exciting current. The optical emission can be in the ultraviolet, visible, or infrared wavelength regions.

Note 3 to entry: The term "LED" represents the LED die (or chip), or LED package. It is also used as part of a compound term, e.g. "LED technology", "LED television".

Note 4 to entry: The term "LED" shall not be used as an adjective for reporting product performance as for example "LED luminous flux", "LED colour rendering" or "LED lifetime". Instead use for example "luminous flux of the LED package", "colour rendering of the LED module" or "lifetime of the LED lamp".

Note 5 to entry: This entry was numbered 845-04-40 in IEC 60050-845:1987.

Note 6 to entry: This entry was numbered 17-662 in CIE S 017:2011.

Publication date: 2020-12