What factors affect the life of LED lamps?

According to the latest international standards, the lifetime of LED lamps with two different values ​​is set: the life of the LED module and the life of the LED ballast. When determining the service life of a lamp fixture, both of these figures must be taken into account.

The life expectancy depends on several factors, including:
  • use LED lamp (brand and type)
  • LED lamp load (the current user)
  • lamp fixture structure (LED lamp or LED module temperature)
  • used ballast
  • product installation environment
  • other structural materials
LED light


Lifetime for LED modules

The life of the LED modules is expressed by the values ​​L 70, L 80  or L 90. The L value represents the amount of light flux as a percentage compared to the light flux of a new lamp within the specified time frame. The L value is accompanied by the B or C value. The B value represents the precision or variability of the L value. The B value for most products is B 50, which means that the stated luminous flux value L refers to the average value. The B-value does not consider the total failure of the modules.
Example: L 80 B 50  70 000 h means that after 70 000 hours, 50% of the lamps have a luminous flux of ≥ 80% of the luminous flux for a new product.
The C value refers to "catastrophic errors" or a total burnout module. This value is given along with the number of hours. The C-value does not consider burn-out LED lamps in a multi-LED module as these are included in the B-value. The C value can be, for example, C 10  or lower. C 10  means that 10% of the modules do not emit light after the stated number of hours. Standard indoor modules have extremely low C values ​​(about 1%), which can be ignored in most cases. This is why C values ​​are not specified for lamp fittings intended for indoor use.

The life of the ballast

Factors affecting the life of ballasts include the ballast structure, its electrical components, and ambient temperature. A reference value t c taken at a measuring point specified for the ballasts. The temperature of this measuring point must never be higher than the value specified by the manufacturer. The life of the ballasts is often expressed, for example, like 50,000 hours per 10%. This means that provided the temperature remains lower than the level specified by the manufacturer, the maximum 10% of the ballasts will break within the specified time limit.

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