DL2482 datasheet(50/82 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

4.6.4 Operation at high

temperatures

On conventional linear fluorescent lamps, the cold spot is normally in the centre of

the lamp. Additionally the luminaire will generally have a large radiating surface

which will ensure moderate tube wall temperatures and high efficiency. In contrast

to linear fluorescent lamps, compact fluorescent lamps are much shorter despite

having high lamp wattages. There is therefore a tendency to make luminaires as

small as possible. Often the thermal characteristics are ignored.

In particularly small enclosed luminaire systems the temperatures at the points on nor-

mal OSRAM DULUX® lamps that have a major influence on luminous flux are so high

that luminous flux and therefore the efficiency of the luminaire are reduced appreciably.

Because in such cases the lamps are no longer operated at their optimum

there are also changes in the electrical values of the lamp (reduced lamp

power) at high ambient temperatures, which in turn will impair the control

gear and shorten the life of the lamp. It is important therefore to take into

consideration the maximum temperatures permitted on the lamp (see 4.8).

At high ambient temperatures, at which conventional OSRAM DULUX® lamps cannot

be operated at their optimum (reduced luminous flux), it makes sense to use OSRAM

DULUX® IN amalgam lamps to achieve maximum luminous flux. Since they achieve

their optimum mercury vapour pressure at a high lamp ambient temperature, amalgam

lamps operate at their optimum efficiency under the same conditions in narrow lumi-

naires and therefore achieve a higher lamp power.

All the electrical and photometric values (lamp current, lamp voltage and luminous

flux) relate to the higher lamp output. In narrow luminaires equipped with OSRAM

DULUX® IN lamps, there is therefore more heat released than is the case with normal

OSRAM DULUX® lamps. This leads to an increase in temperature at the IEC measu-

ring point and must be taken into consideration when designing the luminaires. The

maximum permitted temperature at the IEC measuring point is 140 ºC (measuring

point 1, see 4.8).

4.6.5 Operation at low

temperatures

The following points must be taken into account when operating OSRAM DULUX®

lamps on CCGs and ECGs at low temperatures:

1. The lamp must be capable of starting at the required temperature.

2. After ignition, the tube wall must warm up sufficiently for the lamp to operate

within its optimum range

The low ambient temperatures at which OSRAM DULUX® will ignite reliably in con-

junction with conventional control gear are shown in 4.2. If operated with appropriate

electronic control gear, OSRAM DULUX® lamps with four-pin bases can ignite at

even lower temperatures.

In low-temperature applications, the lamps should be used only in enclosed lumi-

naires. It is important for the volume of the luminaire to be such that the lamp(s) can

warm up rapidly so that ambient temperatures at which the lamps will operate

efficiently are reached within a short time. If there are considerable fluctuations in

temperature, the luminous flux/temperature curves for the different burning positions

should be studied in order to arrive at a suitable compromise between lamp and

luminaire efficiency.

OSRAM DULUX® T/E IN lamps (amalgam lamps), particularly the high-wattage

models, can also be used at low temperatures in luminaires of suitable dimensions.

However, they will take longer to reach their full luminous flux.

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