DL2482 datasheet(67/82 Pages) OSRAM

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7.2

Operating position

7. Measuring OSRAM DULUX®

compact fluorescent lamps

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

Compact Fluorescent Lamps OSRAM DULUX®

Technical Guide

Free-burning OSRAM DULUX® lamps are generally measured in the base-up position,

although according to the IEC the reference burning position for OSRAM DULUX® L

and OSRAM DULUX® F lamps is horizontal. The base-up position is chosen because

the measurements are easier to take and the results are more reliable since the mer-

cury remains at the cold spot at the bottom even when the lamp is moved.

With lamps in the horizontal burning position, the mercury shifts as soon as the lamp is

moved, which destabilises the lamp.

The difference in luminous flux between the base-up and horizontal operating positi-

ons at constant lamp output for OSRAM DULUX® S, S/E, D, D/E, T, T/E is no more

than 1 to 2 %. Deviations of 10 to 20 % can be expected for OSRAM DULUX® T IN

and T/E IN lamps between base up and horizontal operating position.

Burnt-in and stabilised OSRAM DULUX® lamps provide reproducible photometric data

at constant ambient temperature and in an unchanged operating position. Fluctuations

are less than 1 % of the upper range value.

All the cables, control gear and instruments must be arranged, and if necessary shiel-

ded, so that there is no chance of interference from external fields. Use instruments

which will supply the level of accuracy required in the measured values.

Recommendations:

Instruments:

Rms instruments (true RMS)

Accuracy:

±0,2% of the measuring range

Area of application

Frequency:

0-500 Hz (CCG) scanning rate

0-400 kHz (ECG) scanning rate

Crest factor:

> 2 (CCG)

> 3 (ECG)

Lamp supply:

Supply voltage:

Depending on the lamp and

control gear (CCG, ECG or

reference device)

Stability:

± 0,2% during the

measurement

Total harmonic distortion:

< 3%

Suitable supply:

- Noise-free mains

- Electronically regulated

stabilisers

- Rotary measuring generators

- Electronic generators

The apparent power of the supply unit should be five times

the rated system power.

The luminous flux and hence the luminous efficacy of OSRAM DULUX® lamps

depends on the temperature. To achieve optimum operating conditions for the lamp in

the luminaire, it is therefore essential to know either the ambient temperature in the

vicinity of the lamp or the cold spot temperature directly on the lamp.

7.3

Constant

photometric

values

7.4

Electrical

measurements

7.5

Temperature

measurement

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