Introduction. Osram HQI-E 150 W/NDL CL
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1 Introduction
Metal halide lamps offer a number of advantages that favor their use in ever broader areas of application.
These include high luminous efficacy, a long service life and good colour rendering. Because the light is generated in a small space, the discharge lamps almost correspond to a spot light source, with advantages in terms of light control and brilliance of the illumination.
Table 1: The properties of metal halide lamps and resulting application areas
High room, building
Requirements in the application
Property of metal halide lamps
The height requires a lot of light
High luminous fl ux permits few fi xtures light points
Changing lamps is diffi cult and expensive
Long service life with longer change intervals
X
X
Long operating hours
High effi cacy and long service life
X
Realistic reproduction of high value surfaces, pictures, products and TV images
Good colour rendering
High illuminance values
High luminous fl ux permits few fi xtures light points
Luminaires should be small or discreet
High mounting heights and wide spacing demand precise light control
Small dimensions permit compact luminaires
Small arc tubes permit very good light control
X X
X X
X
X
X
X
X
X
X
X
X X
X
X
X
X
X
X
X
X
X
X
The means of generating light is technically complicated. The key principles regarding the operation of these lamps and instructions for their use are listed below.
These application instructions address a large number of users, such as luminaire designers, lighting planning engineers, operating device developers and retailers.
Naturally, not all users will find all sections relevant, but the aim has been to cover the interests of as many users as possible.
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