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OSRAM DULUX® EL – electronic energy saving lamps

Economical alternatives to ordinary light bulbs

Technical Guide

3.5.2

Operation on DC

voltage/emergency

lighting

3.5.2.1 OSRAM DULUX® EL

LONGLIFE

5 W and 7 W

OSRAM DULUX® EL LONGLIFE 5 W and 7 W E27/ B22d / E14 can be operated in the

usual AC voltage range and also on DC voltage in the 176 V DC to 310 V DC range

and on battery powered 220/240 V systems.

At a lower threshold voltage of 176 V DC the lamps will start reliably from 5°C to 50°C

and are insensitive to overvoltages in the DC system up to 310 V DC.

OSRAM DULUX® EL LONGLIFE lamps achieve their rated values in DC operation at

around 280 V DC. For other DC voltages the differences are as follows:

Table 3:

Electrical and photometric data in dc operation

Supply voltage:

Power

Luminous flux1)

System or

input1)

battery current2)

310 V DC

110 %

48 %

280 V DC

100 %

49 %

220 V DC

80 %

78 %

50 %

180 V DC

65 %

60 %

50 %

1) As a percentage of the rated value

2) As a percentage of the rms value for AC voltage

Emergency lighting:

OSRAM DULUX® EL LONGLIFE 5 W and 7 W are suitable for use in emergency

lighting systems. For most emergency lighting systems, VDE 0108 calls for a

starting time of less than one second. Since the requirements for restart time with

DC voltage are met only if the lamp is at operating temperature, they can only be

used for maintained emergency lighting.

Table 4:

Typical starting times for OSRAM DULUX® EL LONGLIFE 5 W and 7 W

(in seconds, cold lamp) in DC operation at different temperatures

Ambient temperature:

176 V DC

198 V DC

220 V DC

280 V DC

0°C

10°C

23°C

< 2

50°C

The requirements for luminous flux, luminance and so on in areas such as corridors

and stairwells must be met by the system in which lighting designers use OSRAM

DULUX® EL LONGLIFE lamps.

3. Lamp data and lamp properties

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