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3.12 Ambient and operating temperatures
Once ignited, the lamp warms up its surroundings and, after
2) Gear
The minimum temperature for some electronic components and for compensating capacitors is
3) Luminaires
In general the construction of the luminaires and optics is not affected by low ambient temperatures down to
Maximum temperatures
1) Lamps
For fluorescent lamps the temperature of the glass tube wall is of prime importance, especially with regard to the applied phosphors. It will be clear that the actual lamp temperature very much depends on the luminaire in which the lamps are placed. Lamps must only be used in luminaires which are constructed for that particular type of lamp. For some lamp types absolute maximum temperatures of a specified spot are given (see SL, Fig. 128).With this in mind, also see maximum and ambient temperatures under point 3) Luminaires.
Fig. 128. The maximum recommended ambient temperature at which an SL lamp can operate is 55 ºC . The part of the lamp with the highest temperature is a 5 mm wide section around the circumference of the housing. The temperature measured in this region, on the surface of the housing, is about 150 ºC . Exceeding this temperature can result in reduction of lamp life.
5 mm
warmest region of the housing
134