Specifications
20 Philips Fortimo HBMt Gen 3 System Design In Guide
Figure 22. AVC heat sinks which can be used in combination
with Fortimo LED HBMt
3
Designing a cooling solution
Conceptually a cooling solution can be represented with a series of thermal
resistances, connecting the heat source to the ambient. Good thermal design can
be seen as minimizing the thermal path from heat source to the ambient.
The thermal performance of a luminaire is mainly determined by two major parts,
the heat sink or main heat dissipating body and the thermal interface which will
shortly be discussed in the following section.
Heat sink design
The module is primarily designed for metal luminaires, in which the luminaire
housing may double as the heat sink. The main purpose of the heat sink in the
thermal chain is to dissipate heat into the surrounding ambient. To do this
efciently a heat sink’s main task is to increase the area in contact with the
surrounding ambient.
Table 18 provides an indication for the required effective cooling area per
HBMt module.
Table 18. Fortimo LED HBMt typical cooling surface requirements (x1000 mm2)
Maximum rated
luminaire ambient
temperature
(Tmax. amb)
4000ml
/840
4000lm
/740
4000lm
/757
6000lm
/840
6000lm
/740
25˚ C 106-127 103-123 97-117 164-197 155-185
35˚ C 127-159 123-154 117-146 197-246 185-232
45˚ C 159-212 154-205 146-195 246-329 232-309
3. Suggested products which can be used with Fortimo LED HBMt systems. Reference to these
products does not constitute endorsement by Philips.
Figure 21. Thermal network