OSRAM DULUX F - Manual (Page 40)

Economical long-life light sources with plug-in bases
Compact Fluorescent Lamps OSRAM DULUX ®
Technical Guide
38
Ageing
Generally speaking, there are no changes in colour temperature or shifts in chromaticity coordinates
in the course of a lamp’s service life. However, lamps do suffer a drop in luminous flux as they age
(see 2.4) and it is the resulting difference in luminance between an old lamp and a new lamp that
gives the impression of a change in colour temperature.
2.3.6 Spectral distribution
The relative spectral power distribution is determined mainly by the light colour, whereas the differ-
ent models and wattages have a negligible effect.
The spectral distributions shown below are therefore typical of all OSRAM DULUX ® lamps for the
relevant light colour (relative values).
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The spectral irradiance distributions refer to an illuminance of 1000 lx. The advantage here is that
the absolute values of any illuminance can be found simply by dividing by 1000 lx:
The spectral intensities are condensed into wavelength ranges of 5 nanometres. In other words,
irrespective of the actual distributions, the values given have been integrated over 5 nm. This corre-
sponds to the standard applied to all calculations of consequential results (such as colour and col-
our rendering).
The spectral power distribution of OSRAM DULUX LUMILUX ® and LUMILUX ® DE LUXE lamps can
be found in the latest edition of the Lighting Program.
Light colours
Light Colour 60 – Red