Which Luminous Flux Is Correct?

Example: You Buy A LED Lamp With The Label 600lm?
Since there is still missing a specification…..at which ambient or substrate temperature is this value?

Which Luminous Flux Is Correct
Is it the luminous flux of the LED (from LED data sheet) or is it a measured value minus all losses (temperature, cover glass)?
The data sheet data of the manufacturers refer almost exclusively to 25°C substrate temperature.
In the quality test, the last process step, in the factory the values ​​are measured. This measurement takes only fractions of seconds and no heating takes place yet.
Extract from the footnote of an LED data sheet:
1) Brightness values ​​are determined with a current pulse duration of 25 ms.
In normal operation, LED lamps/LED lamps/LED tubes usually heat to 50°C or more, depending on the thermal design and ambient temperature. The temperature difference between the heat sink and the LED substrate lies between 7°C and 10°C.
The location of luminaires is mostly on the ceiling where the room temperature is highest.
In practice this usually means Tj>70°C and a lower brightness compared to the data sheet value by 15%.
If the indicated luminous flux is not a measured laboratory value, further losses (5-10%) may be applied by using optics or glass covers.

600 lm (LED data sheet) or in reality only 460 lm (customer use)?
LEDclusive.de presents the technical data transparently and completely.

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