DL2482 datasheet(32/82 Pages) OSRAM

32 / 82 page

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

Compact Fluorescent Lamps OSRAM DULUX®

Technical Guide

2. Lamp data

2.4.1 Definitions

There are several definitions of lamp life and these are applied differently depending

on the type of lamp, the lamp manufacturer and the geographical region. The most

important definitions for compact fluorescent lamps are given below.

Lamp life is the period of time during which a lamp can be operated until it is un-

usable (electrical failure, too little light).

Average rated lamp life is the average value of the life values of individual lamps

operated under standardised conditions (50 % failure). In other words, this is the

period of time in which for a standardised 3-hour switching cycle (165 minutes on/15

minutes off in accordance with IEC 60901) 50 % of the lamps fail.

OSRAM DULUX® lamps

Average rated lamp life

OSRAM DULUX® S, D and T,

8.000 h

OSRAM DULUX® S/E, D/E and T/E with CCG

OSRAM DULUX® S/E, D/E and T/E with ECG

10.000 h

OSRAM DULUX® L and F with CCG

8.000 h

OSRAM DULUX® L and F with ECG

10.000 h

Typical failure distributions are shown in mortality curves.

Because of chemical changes in the phosphor, the luminous flux of a fluorescent lamp

decreases as the lamp ages. The term „maintenance“ is used to indicate how well

luminous flux is retained throughout the life of the lamp. The loss of luminous flux for

the trichrome phosphors (LUMILUX®) used in OSRAM DULUX® lamps is around 15 %.

The mortality and luminous flux curves for OSRAM DULUX® lamps are shown on the

following pages.

2.4

Lamp life and

loss of

luminous flux

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