What is LED binning?


What is LED binning?

In the industrial production of LEDs, there are always differences due to the production process: all LEDs are different - in terms of their characteristics - in a batch of products. To avoid large deviations, those with similar performance are grouped together in "garbage cans". This process is particularly necessary for LEDs with white light spectra.
But why are LED binning ranges important for consumers? The answer is simple: binning systems manage the different LED performance variations during mass production and guarantee LED-specific lighting standards. Most manufacturers sort their products into:
  • ·         Luminous flux (Lumen)
  • ·         Light color (Kelvin)
  • ·         Voltage (Volt)

Luminous flux and color temperature are the most important criteria that directly affect product performance. For example, to sort the LEDs according to the light output, they are individually measured and sorted into specified tray ranges. Manufacturers tend to develop their own binning a system that matches the production results. The larger the range, the more fluctuations are to be expected and vice versa.

ANSI (American National Standard Institute) color temperature standards

To ensure that the LEDs have the same light color, they are sorted according to the American National Standard Institute (ANSI) standard. It defines chromatic aberrations using Macadam ellipses, also known as the standard deviation of color matching. The standard ANSI recommends that the color value must be located in an ellipse within four threshold units.
The ellipses tell the user how far, for example, the light color of each chip differs from each other. The LEDs in these ranges of trays guarantee uniform light colors, for example, 4000K is cold white. Most manufacturers use an average of 2 SDCMs.

Conclusion

The white LED manufacturing tolerances and the definition of the "closest color temperature" ensure that the same products cannot give a different color impression. Keep in mind that there is also a color drift related to use, after having used it for more than 30000 hours for example. In addition, the use of devices and covers can distort the original color temperature. The only way to be more precise is that LEDs will soon become much more precise in terms of technology and quality.

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