DL2482 datasheet(48/82 Pages) OSRAM

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4. Operating characteristics

Economical long-life light sources with plug-in bases.

Compact Fluorescent Lamps OSRAM DULUX®

Technical Guide

OSRAM DULUX® lamps achieve 100 % luminous flux at ambient temperatures of 15 ºC

or 25 ºC, depending on the burning position, only after a certain run-up time has elap-

sed, as the curves above show (see 4.3).

For free-burning lamps, the ambient temperature corresponds to the room temperature.

If lamps are operated in luminaires, the temperature in the immediate vicinity of the

lamp is the one that is relevant to any measurement of luminous flux.

The lamps can be operated in any burning position. However, different burning posi-

tions and different ambient temperatures will lead to different luminous flux values. This

is due to temperature changes at certain locations on the lamp, known as the cold

spots. For this reason, we talk about the cold spot temperature. This temperature

affects the mercury vapour pressure in the lamp and therefore the luminous flux. A

knowledge of the luminous flux/temperature curve is important for luminaire designers.

The base-up position is favoured for indoor lighting, for example, whereas the base-

down position is preferred for out-door lighting (compare the values at 0 ºC, for ex-

ample).

OSRAM DULUX® and OSRAM DULUX® IN lamps are optimised for various temperature

ranges. OSRAM DULUX® IN amalgam lamps are ideal for high ambient temperatures

and emit more than 90 % of their maximum luminous flux over a wide temperature

range. If both types are used in a system with several luminaires there may, however,

be differences in colour perception and brightness. For this reason the two types

should not be used in combination.

Depending on the burning position the maximum luminous flux will be reached only

after a certain Run-up time (see 4.3). Under optimum conditions in CCG and ECG

operation, all the lamps require a burn-in time of 100 h (ageing).

4.6

Luminous flux

as a function of

temperature and

burning position

Typical luminous flux/temperature curves (here OSRAM DULUX® T/E).

4.6.1 Luminous flux/

temperature curves

for OSRAM DULUX®

lamps in general

Ambient temperature for lamp (

°C)

100 %

80 %

60 %

40 %

20 %

0 %

-20

-10

Base down and horizontal

Base up

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