DS7840 OSRAM, DS7840 Datasheet - Page 68

• 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
7.5.2 Cold spot
7.5.3 Measuring
7.6
7.5.1 Ambient
temperature for
amalgam-free
lamps
amalgam lamps
Reference lamps
temperature
Amalgam lamps (OSRAM DULUX
ambient temperatures. They therefore achieve their optimum operating conditions
(rated data) only at the high temperatures that occur, for example in compact luminai-
res. Maximum luminous flux ( 90 % of rated value) is achieved in the 10 to 70ºC tem-
perature range. If photometric measurements are taken under reference conditions (an
ambient temperature of 25ºC, see 7.5.1), it must be remembered that the measured
luminous flux may be as much as 10% below the maximum luminous flux that the
lamp can produce.
The cold spot temperatures are dependent on the burning
position and lie approximately in the range from 40ºC to 50ºC
(optimum operating conditions). In the base-up operating
position and no air circulation, temperature measuring point 3
(see 4.8 – Lamp temperatures and limit values) generally
corresponds to the cold spot.
The cold spot can however shift as a result of a different
operating position or other influences.
Measuring point 3 (cold spot temperature in base-up operating position) is defined for
OSRAM DULUX
To determine the temperature at measuring point 3 (not in the case of the IN version)
thermocouples (NiCr-Ni thermo-elements) are cemented there with a neutral, trans-
lucent adhesive.
Unless otherwise indicated, the lamp data in this guide is based on an ambient
temperature of 25ºC ± 1 ºC in draught free air in accordance with DIN 5032 (Sheet 4).
Lamp data as a function of actual ambient temperature or cold spot temperature is
also measured in draught free air.
Reference lamps (luminous flux and electrical values) can be obtained from the accre-
dited test laboratory of OSRAM GmbH (DAR register number: DAT-P-043/94-00,
Lighting Technology). Reference lamps are also available with thermoelements cemen-
ted at measuring point 3.
For prices and delivery times please contact:
®
lamps at the outer lamp arc, centred on the bulb. (See 4.8)
®
OSRAM GmbH
Dept. CFL M-M
Hellabrunner Str. 1
D - 81536 München
®
T IN and T/E IN) are specially designed for high
Tel.:
Fax.: [phone]
(+49) 89/6213-2604
7. Measuring OSRAM DULUX
compact fluorescent lamps
Cold spots
67
®