Technical Design-in Guide Engine QLE G2 PRE KIT | 01-2019 | 1.0 | en
Thermal Aspects
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Relative luminous flux vs. operating temperature
Lifetime characteristic
The table shows the change in luminous flux in percent over an operating time
Forward current
tp temperature
L90 / F10
L90 / F50
L80 / F10
L80 / F50
L70 / F10
L70 / F50
825 mA
45 °C
>50,000 h
>50,000 h
>50,000 h
>50,000 h
>50,000 h
>50,000 h
55 °C
30,000 h
>50,000 h
>50,000 h
>50,000 h
>50,000 h
>50,000 h
65 °C
16,000 h
37,000 h
31,000 h
>50,000 h
46,000 h
>50,000 h
75 °C
8,500 h
20,000 h
17,000 h
39,000 h
27,000 h
>50,000 h
7.2.4. Requirements for the heat sink
Although the operating temperature of the modules is continually monitored during operation and the power is automatically reduced
in the event of excess temperature, the modules should not be operated without a heat sink.
The heat sinks must be dimensioned to provide adequate cooling capacity.
The R value is important for selecting an appropriate heat sink. This value depends on the light output of the module and on the
th
ambient temperature in which the module is to be operated. The R value of the heat sink must be smaller than the required R
th
th
value.
I
NOTICE
Please check the information on the operating temperature and the requirements for cooling in the module data sheets.
