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4. LED features
This section describes some of the characteristics of LEDs: conversion efficiency, color and lifetime.
4.1 Component efficiency
The energy efficiency η e of an LED is a complex quantity and the result of several factors:
η f , the internal efficiency, which is the ratio of the average energy of the photon produced (equal to hν) to the total energy that the electron-hole pair acquires from the external energy source (equal to eV) ;
η ext , the external quantum efficiency, which is the ratio of the number of photons emitted to the number of electrons...
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LED features
A few innovations
Bibliography
Bibliography
Standards and norms
Definitions and characteristics
- General lighting – Light-emitting diode (LED) products and related equipment – Terms and definitions – Modified by NF EN 62504/A1 (May 2018) - NF EN 62504 - 12-14
- Light and lighting – Measuring and presenting photometric data for lamps and luminaires – Part 4: LED lamps, modules and luminaires - NF EN 13032-4+A1 - 06-15
Safety requirements...
Regulations
Key regulations on environmental performance and eco-design
Regulation (EU) No 1194/2012 of December 12, 2012 implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to ecodesign requirements for directed lamps, light-emitting diode lamps and related equipment, amended
Regulation No 1428/2015 of August 25, 2015 amending Commission Regulation...
Industrial players
The main industrial players in the LED market are :
Cree https://lighting.cree.com/
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