PXF Lighting is a Polish manufacturer of lighting fixtures and systems that delivers modern lighting solutions to the European market. In this article, we present the most important technical parameters of PXF Lighting LED lighting fixtures along with their discussion.
In this article you will read about:
key technical parameters of PXF Lighting LED lighting fixtures . We will discuss: the operational durability of LEDs, the decrease in luminous flux over time, the degradation and lifetime of diodes, as well as MacAdam ellipses, SDCM, LLMF and binning.
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LED operating life
The service life of LED diodes is one of the most important technical parameters determining the actual service life. The service life of LED diodes is defined by the record: L80 B10 >50,000 h, which means that: during 50,000 hours of operation of the lighting fixture, the luminous flux will not be lower than 80% of the initial value, and the number of diodes that will emit a luminous flux below 80% will not exceed 10% all diodes from the tested production series.
Luminous flux decrease over time
Luminous flux decay over time is a parameter of LEDs that describes the change in luminous flux during the operation of the lighting fixture . As the operating time passes, the intensity of the luminous flux of LEDs decreases. The scale of this phenomenon depends on the class of chips used.
The LED lifespan parameter described by PXF Lighting is presented at 90% or 80% of the nominal value. The designations used are L90 and L80, respectively. The decrease in luminous flux over time is closely related to the parameter defined as the LED lifespan.
LED Lifespan
LED diode life is a parameter describing the operating time after which the luminous flux decreases (L-factor) and the degree of degradation (B-factor). LED diode life is therefore a technical parameter directly related to the decrease in luminous flux over time and to the degradation of LED diodes.
The standard reference point is the operating time of 50,000 h. The coefficients L and B are assigned to this period. The extended description of the operating time may cover a period of e.g. 80,000 h. In this case, the coefficients will take a lower value compared to the standard description, e.g. L60 B20 > 80,000 h.
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LED Degradation
LED degradation is a parameter of LEDs that describes the number of chips that, after a given period of operation, will emit a luminous flux lower than the flux indicated by the flux decline factor L.
In other words: degradation is a parameter of an LED array that describes the number of chips with a flux lower than L at a given operating time.
MacAdam and SDCM ellipses
The MacAdam ellipse is an elliptical region located on the CIE chromaticity diagram. The area indicated by the diagram includes color discrepancies indistinguishable to the human eye compared to the color inside the ellipse. SDCM (Standard Deviation Color Matching) is the standard deviation of color matching. The SDCM parameter defines the color matching of light based on the MacAdam ellipse. SDCM is defined as the range of the ellipse around a perfect black body, and the smaller the ellipse multiplicity, the greater the color consistency of the light. In indoor lighting, the most commonly used value is SDCM 3. Defined as a 3-fold MacAdam ellipse, it provides a highly acceptable level of color consistency while maintaining a favorable price-quality ratio.
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LLMF
LLMF (Lamp Lumen Maintenance Factor) is the initial flux level after 60,000 h. The parameter defines the percentage value of the LED luminous flux after 60,000 hours of operation. Otherwise, LLMF is defined as the light source luminous flux maintenance factor.
LED Binning
Binning is an automated process of sorting and grouping manufactured LEDs based on a set of technical parameters. The criteria for sorting and grouping LEDs are most often their: brightness, color, color rendering index, and rated voltage. LEDs with specific sets of parameters that have undergone the binning process are placed in one reel for the SMD machine.
