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Haitz's law is an observation and forecast about the steady improvement, over many years, of light-emitting diodes (LEDs). It claims that every decade, the cost per lumen (unit of useful light emitted) falls by a factor of 10, and the amount of light generated per LED package increases by a factor of 20, for a given wavelength (color) of light.
This trend in increased output has been called Haitz's law after Roland Haitz. [70] [71] Light output and efficiency of blue and near-ultraviolet LEDs rose and the cost of reliable devices fell. This led to relatively high-power white-light LEDs for illumination, which are replacing incandescent and fluorescent lighting. [72] [73]
Examples for Haitz's law—which predicts an exponential rise in light output and efficacy of LEDs over time—are the CREE XP-G series LED, which achieved 105 lm/W in 2009 [52] and the Nichia 19 series with a typical efficacy of 140 lm/W, released in 2010.
Haitz's law is an observation and forecast about the steady improvement, over many years, of light-emitting diodes (LEDs). Hamilton's principle : the dynamics of a physical system is determined by a variational problem for a functional based on a single function, the Lagrangian, which contains all physical information concerning the system and ...
Haitz's law; High-CRI LED lighting; L. LED art; LED backlight; LED circuit; LED display; LED driver; LED filament; LED film; LED street light; LED strip light; LED to ...
Illustration of Haitz's law, showing improvement in light output per LED over time, with a logarithmic scale on the vertical axis. Before the introduction of LED lamps, three types of lamps were used for the bulk of general (white) lighting: Incandescent lights produce light with a glowing filament heated by electric current.
English: Plot of Haitz's law of the luminosity per package of LEDs increasing exponentially over time, while the cost per lumen drops exponentially. Feel free to add new data points and upload updated versions using the provided Matplotlib code.
The wavelength of the light emitted is a function of the band gap of the semiconductor material used; materials such as gallium arsenide, and others, with various trace doping elements, are used to produce different colors of light. Another type of LED uses a quantum dot which can have its properties and wavelength adjusted by its size. Light ...