Specifications
Design-in guide Philips Fortimo LED Line High Voltage System 29
LED Line 1ft 2200 lm 1R luminous flux as a function of Tc
LED Line 1ft 1250 lm 2R luminous flux as a function of Tc
Cooling via the luminaire
The unflatness of the area where the LED line is mounted should not
exceed 1 mm along the LED Line
Thermal contact
The unflatness of the area where the LED Line is mounted should not
exceed 1 mm along the LED Line length in order to ensure good thermal
contact and to avoid stress and strain on the LED Line. We also
recommend that good-quality screws are used in order to ensure optimal
contact between the bottom surface and the luminaire surface, without
the need for thermal paste.
Cooling surface area and material
The amount of heat that needs to be transferred away from the LED Line
to the ambient air is about 4 W for the LED Line 650 lm 3R, 6 W for the
LED Line 1100 lm 3R and 13W for the LED Line 2200 lm 1R. This heat is
dissipated via the luminaire housing.
If the luminaire housing has sufficient thermal conductivity, the heat will
spread further, thereby increasing the effective cooling area. We
therefore recommend use of a material that has high thermal conductivity
and is of sufficient thickness. This will lower the case temperature and
enable the system to perform better (lifetime and light output).
The required size of the luminaire housing area per LED Line depends on
the design and volume of the luminaire, the thermal properties of the
material used and the expected ambient temperature.
Aluminum is usually preferable to steel because of its higher thermal
conductivity, although for most applications steel is likely to be adequate
for ambient temperatures of up to 35 °C. For higher ambient
temperatures, the use of aluminum should be considered.
Material
k (W/mK)
Copper
400
Aluminum
200
Brass
100
Steel
50
Corrosion-resistant steel
15
Thermal conductivity of different materials
Recommendations
General thermal design guidelines to improve the thermal management
and performance of a luminaire:
• Simplify the heat path from Tc to cold ambient air.
• Use good thermally conductive materials in the primary heat path
(e.g. aluminum).