Specifications
18 Philips Fortimo HBMt Gen 3 System Design In Guide
Figure 18. Temperature test point on bottom PCB
When the module is used in combination with Xitanium LED drivers, the default
driver prole will ensure the correct Module Temperature Protection (MTP)
settings.
The thermal de-rating feature will be triggered above a case temperature of 85° C.
The Philips LED Light Engine prole is dened for module operated with a
Tcase=85° C. For use in applications where a lower Tcase must be reached, please
contact your Philips representative for guidelines.
Temperature measurements
The maximum ambient temperature at which the luminaire will operate constitutes
the initial key criterion for dening the correct temperature limit and validating the
thermal luminaire design.
Example for outdoor applications:
If the desired maximum operating ambient temperature is 40° C or lower, the
luminaire design needs to ensure that the module temperature does not exceed
85° C when tested in a lab environment at 40° C ambient.
For indoor applications, the luminaire design needs to ensure that the module
temperature does not exceed 85° C and meet a maximum ∆T between the module
and ambient of ≤ 50° C.
If the desired maximum operating ambient temperature is 25° C or lower, the
luminaire design needs to ensure that the module temperature does not exceed
75° C when tested in a lab environment at 25° C ambient. Maximum ∆T
meets 50° C.
Critical temperature point (Tcase)
For LEDs, the junction temperature is the critical factor for operation. Since
there is a direct relation between the case temperature and the LED junction
temperature, it is sufcient to measure the aluminum casing of the Fortimo LED
HBMt at its critical temperature point, see Figure 19.
If the case temperature at the Tcase point exceeds the specied maximum Tcase,
this will have an adverse effect on the performance of the LEDs and the Fortimo
LED HBMt module in terms of light output, lifetime and lumen maintenance.
Note: The default MTP setting for Xitanium Programmable LED drivers is “Philips
LED Light Engine”. This setting offers optimized prole for use with all Philips
LED modules, including Fortimo LED HBMt, for maximum Tcase. For best system
performance, we advise not changing the default prole or the dimming curve
Note: The ambient temperatures are refering to the average ambient temperatures
around the luminaire during the operational period of the module.