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Lumen maintenance L90B50 @ 50,000 hours
The quality of the LED SLM portfolio is backed by the claim of B50L90 @ 50,000 hours. This means that at 50,000
hours of operation at least 50% of the LEDs’ population will emit at least 90% of its original amount of lumens.
Average rated life is based on engineering data testing and probability analysis. The Fortimo LED SLM modules are
specified to reach L90B50 for the nominal Keylight specifications.
Example lumen maintenance as a funtion of operating hours for B50 at Tc nominal.
Operating lifetime (hours)
Lumen Maintenance (%)
Keylight test facility
