What is the MacAdam ellipse?
The MacAdam ellipse shows how LEDs, belonging to a certain production line, deviate from standard values in their colour consistency. Since 1st September 2013, manufacturers in the EU have to provide information about these deviations. Specifically, this means that the deviation in colour temperature between LEDs must be shown on data sheets. In this blog article, you can find useful information about the MacAdam ellipse and why it is important when buying new LEDs.
Deviation of LED colour and brightness
This might be a familiar scenario for you: two newly-bought LEDs of the same brand or product series are both illuminated. Despite them being identical on the product sheet, they emit light of a different colour temperature or brightness … a phenomenon you will not have experienced with incandescent or halogen bulbs.
That's because these deviations only occur with LEDs. When they first appeared on the market, LEDs differed immensely, even if they came from the same production line. Thanks to advances in technology, they've now improved greatly - especially products from top-quality brands. Small deviations in colour temperature (measured in Kelvin) or brightness (measured in Lumen) may still occur, however. These are caused by unpreventable things like tolerances in the components used during the manufacturing process, for instance. Unfortunately, this means that deviations in LEDs can be significant enough to be discernible to the human eye.
The MacAdam ellipse
The MacAdam ellipse demonstrates deviations in colour. The ellipse was developed by and named after scientist David MacAdam. He experimented with the perception of colour and differences in chromaticity. Afterwards, he transferred the results to a CIE chromaticity diagram that has been in use since 1931.
MacAdam’s measurements showed that deviations from a reference colour could be represented in the form of ellipses arranged around the initial value - not, as originally suspected, in the form of even circles. The ellipses, therefore, showed that deviations in colour temperatures were gradual.
The steps describe different degrees of visibility: if there are colour differences within only one step of the MacAdam ellipse, they are not recognisable to the human eye. Even with two or three steps (3 SDCM), variations are hardly noticeable. The following table provides an overview:
|MacAdam ellipses (SDCM)||Visibility|
|1 SDCM||Almost no visible deviations|
|2 SDCM||Deviations can be seen with instruments|
|3 SDCM||Few deviations visible with human eye|
|4 SDCM||Visible deviations|
|5 SDCM||Strongly visible deviations|
According to the ANSI standard (American National Standards Institute ANSI standard ANSI C78.377A), the recommendation is: An LED must be of such quality that the colour values deviate up to a maximum of 6 levels of the MacAdam ellipse.
What is LED binning?
Unfortunately, deviations in the colour temperature and brightness of LEDs are inevitable and simply have to be accepted by manufacturers. The only thing that can be done is to optimise the production process as much as possible and sort through the LEDs after they've been made. This sorting process is called binning: products with similar deviations are separated and sorted into so-called bins. LEDs that end up in the same bin have consistent colour temperatures. This way, for example, you can be sure that a light that has a colour temperature of 4000 Kelvin will be seen as cool white.
The advantage of this process? You, as a customer, will be able to choose products that have consistent colour temperatures. Thus, there will be no unpleasant differences in the colour temperature or brightness when you turn on your LEDs at home or in the workplace.
Keep in mind that this process is complex and expensive. Therefore, the following rule applies: the cheaper a product, the bigger the differences within a certain product line. High-quality products may have a higher price, but the greater consistency in colour temperature and brightness make them a worthwhile investment.
LEDs from Anylamp
At Anylamp you find a wide range of high quality LED lighting in various colour temperatures. Use the filter option to select your favourite colour temperature.