DL2482 datasheet(51/82 Pages) OSRAM

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

Compact Fluorescent Lamps OSRAM DULUX®

Technical Guide

4. Operating characteristics

The technical requirements for dimming also apply to amalgam lamps without restric-

tions. Note also that the chemical activity of the amalgam causes a delayed reaction of

the lamp with regard to changes in power. This generally occurs with visible differences

from one lamp to another. When amalgam lamps are dimmed there may therefore be

noticeable differences in brightness and colour perception between lamps of the same

type, even if they are operated under identical conditions.

The luminous flux of free-burning OSRAM DULUX® IN lamps stabilises at 100 % after

15 to 30 minutes. In the case of OSRAM DULUX® lamps without amalgam the lumi-

nous flux stabilises within less than 10 minutes.

These differences in brightness between amalgam lamps of the same wattage can also

occur if the lamps are operated in luminaires with different volumes. In such cases the

different temperatures within the luminaires have an effect.

Amalgam lamps can however be dimmed, with the restrictions mentioned above.

If the lamps are stored or left off for a long period of time (> 20 hours) the mercury may

migrate into the amalgam. At low dimmer settings and ambient temperatures there is

then the possibility that the lamp will produce only very low light output (Hg-free stage,

burning pink). This is caused by a too low discharge temperature (Hg).

The solution is to allow the lamp to operate for about 5 minutes at full output and then

to dim it (no damage to the lamp).

For optimum operation, new lamps should be aged for 100 hours at full output before

they are dimmed for the first time.

4.7.1 Dimming of OSRAM

DULUX®.../E IN

amalgam lamps

Important notes regarding the dimming of compact lamps with and without amalgam:

• For optimum operation, new lamps should be aged for 100 hours at full output

before they are dimmed for the first time.

• Amalgam lamps react more slowly than lamps without amalgam. For this reason it is

best not to mix the two types in a system.

• Colour temperature differences of around 150 K are noticeable between dimmed

(3 % luminous flux) and undimmed lamps (100 % luminous flux).

• When the lamps are dimmed to the lowest dimmer setting (3 % luminous flux) the

colour temperature shift compared with undimmed lamps is initially around 500 K.

After a stabilization period of 30 to 40 minutes (amalgam lamps) and 20 to

30 minutes (for lamps without amalgam) this reduces to about 150 K.

4.7

Dimming

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