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Lighting Requirements
1. Light colour
Light colour is a lamp’s own colour. The most similar colour
temperature (Kelvin) is used to identify the respective light
colour. All lamps with a most similar colour temperature
of over 5300 K belong to the group of daylight white (tw)
light sources, like e.g. daylight white luorescent lamps. High
pressure mercury lamps and “white” luorescent lamps
belong to the group of lamps with neutral white (nw) light
colours with colour temperatures between 3300 K and
5300 K. Incandescent lamps and “warm tint” luorescent
lamps belong to the group of lamps with warm white (ww)
light colours with a colour temperature under 3300 K.
2. Colour rendering
The general colour rendering index Ra, derived from
a set of eight test colours taken from everyday live, is
used to evaluate the colour rendering characteristics of
a lamp. Its theoretical maximum value is 100. The lower
the colour rendering index the worse the colour rendering
characteristics of the lamp. For practical purposes the
colour rendering indices are divided into diferent levels.
DIN EN 12464-1 states six of these levels. Lamps of level
1A are used in applications requiring a colour rendering
as close as possible to the natural appearance, e.g. in the
printing trade, museums, textile and leather goods shops.
Lamps of level 1B belong to the 3-band luorescent lamps
predominantly installed in administrative buildings,
schools, industrial and sports facilities. Lamps of level 2A
still have good colour rendering characteristics. Lamps of
level 3 are used for applications in heavy industry where
colour rendering is not that important. Lamps of colour
rendering level 4 are not to be utilized indoors with the
exception of high pressure sodium lamps (Ra=20) in
speciic applications. The colour rendering characteristics
of the lamps required for the various kinds of rooms and
applications are stated in accordance with the levels in
DIN EN 12464-1.
MHN-T
TL-D/940/840
Neutral white
nw
TL-D /930 /830
CDM-T
Incandescent
TL-D /827
SDW-T
SON
Warm white
ww
TL-D /865
TL-D /965
MHD 1800 W
TL-D /950
Daylight
tw
7000 K
Kelvin
6000 K
5300 K
4000 K
3000 K
3300 K
2000 K
1000 K
Light colour
Lamps
Colour
temperature
Halogen
-273˚C 0K
Quality Index — Light Colour
Quality Index — Colour Rendering
Level
Index Lamps
Incandescent, Halogen
TL-D /90 De Luxe
1A
TL-D Super 80
SDW-T, CDM-T, CDM-TP
1B
TL-D
2A
TL-D /33-640
SON-COMFORT
2B
TL-D
HPL-N
3
SON
4
20
40
60
70
80
90
100
Appendix>
Lighting Technology
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