DS7840 OSRAM, DS7840 Datasheet - Page 35

• Manufacturer Part Number: DS7840
• Description: LAMP, DULUX, S, COOL, 7W
• Manufacturer: OSRAM

Specifications of DS7840

• Supply Voltage: 47V
• Base Type: 2 Pin
• Power Rating: 7W
• Luminous Flux: 400lm
• Length: 137mm
• Colour Temperature Typ: 4000K
• Svhc: No SVHC (15-Dec-2010)
• External Depth: 19.5mm
• External Diameter: 19.5mm
• External: RoHS Compliant
• Lamp Base Type: 2 Pin
• Rohs Compliant: Yes
• Average Bulb Life: 8000h
• Bulb Diameter: 19.5mm

Economical long-life light sources with plug-in bases.
Compact Fluorescent Lamps OSRAM DULUX
Technical Guide
34
2.4.4 Effect of switching
operations on
lamp life
Average rated lamp life is based on a switching cycle of 165 minutes on and 15 minu-
tes off in accordance with IEC 60901. 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 than this, it will not last as long.
If an electronic control gear designed for pre heat start is used, the number of possible
switching operations is greatly increased against operation with a CCG thanks to op-
timum warm starting of the lamp.
The typical failure curves below show the basic relationship between the number of
switching cycles and lamp life under rated conditions.
After the lamps have been switched off it is necessary to wait a certain time, depending
on the type of equipment (see ECG specifications), to ensure optimum warm restart
(essential for maximum lamp life).
12000
10000
8000
6000
4000
2000
0
0
®
10000
CCG
20000
30000
Number of switching operations
40000
50000 60000
ECG
70000
80000
90000 100000
2. Lamp data