D7BCT datasheet(43/54 Pages) OSRAM

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OSRAM DULUX® EL – electronic energy saving lamps

Economical alternatives to ordinary light bulbs

Technical Guide

3. Lamp data and lamp properties

3.6 Reduction in luminous

flux over time

Because of chemical changes in the phosphor and the glass the luminous flux of

an energy saving lamp will decrease with age. This reduced is around 30 % with

conventional phosphors and only around 25 to 27 % with the LUMILUX®

tri-phosphors used in all OSRAM DULUX® EL and OSRAM CIRCOLUX® EL lamps.

Fig. 15a:

Typical relationship between luminous flux and hours of operation for

OSRAM DULUX® EL LONGLIFE

Fig. 15b:

Typical relationship between luminous flux and hours of operation for

OSRAM DULUX® EL ECONOMY

100

3000

6000

9000

12000

15000

18000

1000

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7000 8000

10000 11000

13000 14000

16000 17000

100

3000

6000

9000

12000

15000

18000

1000

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16000 17000

Operating hours (h)

100

Decrease in luminous flux for OSRAM DULUX® EL LONGLIFE 7, 11, 15, 20 and 23 W

Operating hours (h)

Decrease in luminous flux for OSRAM DULUX® ECONOMY 8, 12, 16, 21 and 24 W

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