DF2484 datasheet(10/82 Pages) OSRAM

10 / 82 page

1. General

Economical long-life light sources with plug-in bases.

Compact Fluorescent Lamps OSRAM DULUX®

Technical Guide

Technical design of OSRAM DULUX® S and OSRAM DULUX® T

Cold spots

Lamp tube

Pin base

Casing for starter and radio

interference suppression

capacitor for lamps with

two-pin bases

1.4

Technical design

and operation

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® lamp act as cold spots. The temperature at these cold spots

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.

In OSRAM DULUX® lamps, as in conventional fluorescent lamps, light is generated by

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.

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.

The principle of light generation in a fluorescent lamp

K Nucleus of the atom

H Shell electron of the atom,

on an inner orbit

e- Exciting electron

(impact energy)

A* Excited electron,

on an outer orbit

R Radiation emitted as light and UV

when A* falls back to H

Light

Note: Amalgam lamps (IN) do not have cold spots like conventional Hg lamps (see 4.7 and 4.7.1).

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