OSRAM DULUX F - Manual (Page 46)

Economical long-life light sources with plug-in bases
Compact Fluorescent Lamps OSRAM DULUX ®
Technical Guide
44
2.4 Lamp life and maintenance
2.4.1 Definitions
There are several definitions of lamp life, which are applied differently depending on the type of
lamp, the lamp manufacturer and the geographical region. The most important definitions for com-
pact fluorescent lamps are given below.
Lamp life is the period of time during which a lamp can be operated until it is unusable (electrical
failure, light loss / insufficient light output).
Average rated lamp life (B50) is the average value of the life values of individual lamps operated
under standardized conditions (50 % failure). In other words, this is the operation time at which for a
standardized 3-hour switching cycle (165 minutes on/15 minutes off in accordance with IEC 60901)
50 % of a sample population of lamps have failed.
OSRAM DULUX ® lamps Average rated lamp life (B50)
OSRAM DULUX ® D/E XT, T/E XT, L XT with ECG (BAT) 36,000 h
OSRAM DULUX ® S/E, D/E, T/E PLUS*, T/E HE, T/E CONSTANT*, L, L HE,
L CONSTANT and F with ECG (BAT)
20,000 h
OSRAM DULUX ® S, D, D ES, T PLUS*, T CONSATNT and F with CCG 10,000 h
CFL SQUARE ® with ECG (BAT) or CCG 10,000 h
* Different lifetime for single lamps: T/E PLUS & T/E CONSTANT 42W: 13,000 h, T PLUS 13W: 3,200 h, T PLUS 18W: 3,900 h
Because chemical changes in the phosphor during the lamp life, the luminous flux of the lamp de-
creases as the lamp ages. The term “maintenance” is used to indicate how well the luminous flux is
retained throughout the life of the lamp.
2.4.2 Maintenance for OSRAM DULUX ® lamps
For further information, please consult http://catalog.myosram.com .
2.4.3 Mortality charts of OSRAM DULUX ® lamps
For further information, please consult http://catalog.myosram.com .
2.4.4 Effect of switching operations on lamp life
Average rated lamp life in CCG or ECG operation is based on a switching cycle of 165 minutes on
and 15 minutes off in accordance with IEC 60901.
In CCG operation, if there are fewer switching operations than under these standard conditions,
average rated lamp life will be increased. If, however, the lamp is switched on and off more often, it
will not last as long.
If an electronic control gear designed for pre-heat start according to IEC 60901 is used, the number
of possible switching operations is greatly increased compared to operation with a CCG, due to an
optimum electrode preheating.