DS9840 OSRAM, DS9840 Datasheet - Page 10

• Manufacturer Part Number: DS9840
• Description: LAMP, DULUX, S, COOL, 9W
• Manufacturer: OSRAM

Specifications of DS9840

• Supply Voltage: 60V
• Base Type: 2 Pin
• Power Rating: 9W
• Luminous Flux: 600lm
• Length: 167mm
• 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
1.4
Technical design
and operation
Technical design of OSRAM DULUX
This method of generating light needs only one quarter (or one fifth if electronic control
gear is used) of the electrical energy which an incandescent lamp of the same bright-
ness would need.
In OSRAM DULUX
a low-pressure gas discharge. Electrical current is conducted through the tube from
one electrode to the other. The electrons excite mercury atoms so that they emit
optical radiation. This radiation is converted into visible light by the triphosphor coating
on the inner wall of the tube.
The principle of light generation in a fluorescent lamp
High luminous efficacy (the relationship between luminous flux and power consump-
tion) is achieved when an optimum mercury vapour pressure exists in the discharge
tube. This depends on the temperatures on the inner tube wall and is regulated by the
vaporisation of mercury and its condensation at the cool zones of the discharge tube.
In contrast to fluorescent lamps, the corners at the top of the discharge tube on an
OSRAM DULUX
depends to some extent on the burning position of the lamp and the ambient tempera-
ture. Good conditions for luminous flux and lamp performance exist when the tempe-
rature at these cold spots is between 40 ºC and 50 ºC.
1)
Note: Amalgam lamps (IN) do not have cold spots like conventional Hg lamps (see 4.7 and 4.7.1).
®
e-
lamp act as cold spots. The temperature at these cold spots
®
®
lamps, as in conventional fluorescent lamps, light is generated by
A*
Light
R
Cold spots
Pin base
Casing for starter and radio
interference suppression
capacitor for lamps with
two-pin bases
Lamp tube
®
S and OSRAM DULUX
1)
K Nucleus of the atom
H Shell electron of the atom,
e- Exciting electron
A* Excited electron,
R Radiation emitted as light and UV
®
on an inner orbit
(impact energy)
on an outer orbit
when A* falls back to H
T
1. General
9