DS7840 OSRAM, DS7840 Datasheet - Page 43

• 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
42
4.2
Starting at low
temperatures
Some of the models in the OSRAM DULUX
for use in outdoor lighting systems where temperatures during the cold season may be
0 ºC or below. Some models ignite quite readily even at these low temperatures, and
some have critical ignition limits. When selecting lamps and luminaires, therefore, the
temperature factor should also be considered.
The following table shows the low temperature ranges at which various models with
two-pin bases will still start reliably in conjunction with conventional control gear.
Operating conditions:
Lamp
OSRAM DULUX
OSRAM DULUX
OSRAM DULUX
OSRAM DULUX
OSRAM DULUX
OSRAM DULUX
OSRAM DULUX
With electronic control gear, the temperature range for reliable ignition is extended down-
wards, even for critical models. Irrespective of the ambient temperature, the lamp is
always supplied with the optimum ignition pulse. Repeated attempts to ignite the lamp at
low temperatures will damage the lamp. With ECGs this situation is avoided altogether.
The temperature range in which an ECG will reliably ignite a lamp depends an the ECG
itself. Consult the ECG manufacturer for more details. Depending on the particular lamp
and the particular ECG used, OSRAM QUICKTRONIC
cent lamps at temperatures as low as -15 ºC or -20 ºC.
Reliable ignition (inductive operation) of the lamps (at low temperatures according to the
above table) takes place at rated voltage within a period of 60 s. There is a chance that
these ignition times will increase as the lamps age (ageing of the starters) or if moisture
penetrates the luminaire. In capacitive operation a longer ignition time than with induc-
tive operation must be expected.
In the case of inductive operation with undervoltage, the temperature threshold for re-
liable ignition of the lamps is raised. This longer ignition time must be taken into account.
®
®
®
®
®
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®
S
D
T
T IN 26 W
L
L SP
F
®
5°C
230 V/50 Hz supply voltage
Base-down position
13 W, 18 W,
7 W, 9 W
26 W
26 W
18 W
0°C
Reliable ignition at temperatures down to:
-5°C
13 W, 18 W
®
-10°C
compact fluorescent lamp range are ideal
-15°C -20°C
®
units can ignite compact fluores-
4. Operating characteristics
36 W 18 W, 24 W
-25°C
36 W
18 W, 24 W
18 W, 24 W
5 W, 11 W
-30°C
10 W