Philips Indoor Luminaires Indoor Furnishings User Manual


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Specication data lamps
Philips indoor luminaires Technical data 12.13
Technical data
Damage factor/Fading of color
Radiation in the form of light or heat can cause damage to objects
or merchandise being displayed. The extent of deterioration of
objects upon exposure to light, such as fading colors, corrosion and
disintegrationofstructureandmaterial,dependson:
- sensitivity of the material to radiant energy
- illumination level
- time of exposure
- spectral composition of the radiation.
Withoutastandardclassicationavailableforthesensitivityof
materials in relation to the amount of damage under a certain light
source, the only indication which can be given is the ‘probable damage’
caused to an object.
This method ignores the spectral sensitivity of the object concerned,
and only indicates the relative damage caused by one light source
compared to another. Each light source can be characterised by the
damage factor DF, which yields the relative damage caused by this
source compared to other sources, provided that the illuminance and
exposure times are constant.
The fading risk (FR) is the deterioration in color caused by one light
source, calculated for a certain period of time, relative to a reference.
A fading risk of 160 is obtained in a ‘worst-case’ situation, e.g. an object
in a shop window illuminated by bright sunshine (10,000 lux) for a
period of 1 hour.
Example1:theformulamentionedinthetableforanilluminanceof
500lux,realisedwithuorescentlampscolor830,resultsinafading
risk of 2. Thus the possible fading of pigments will occur 80 times
slower than at the reference, FR of 160, so it is negligible.
Example2:aprojectorproduces10,000luxatacertaindisplay.
Applyinge.g.aMASTERColourCDMlampresultsinafadingrisk
of 40. Light sources with more ultraviolet radiation, such as metal-
halidelampswithoutUV-lteroropenhalogenlamps,might,athigh
illuminances, result in damaging radiation.
Daylight conditions / light source Damage factor
Overcast sky – average 1.52
Sunlight – average 0.79
Daylight through 4 mm window glass 0.43 - 0.68
Incandescent lamp
0.08
PAR38 0.11
PAR38 cool beam 0.07
Open halogen lamp 0.17
Closedhalogenlamp 0.10
MASTERLine ES 0.10
MASTERColourCDM 0.22
White SON SDW-T 0.10
Open metal halide lamp 0.50
Closedmetalhalidelamp 0.25
Fluorescent lamps - color
/827 0.19
/830 0.20
/840 0.21
/850 0.22
/865 0.24
/927 0.15
/930 0.15
/940 0.18
/950 0.22
/965 0.24
/29 0.17
/33 0.24
/79 0.22
FR = 0.02 x DF x E x T where
FR = fading risk
DF = damage factor
E = illuminance in lux
T = exposure time in hours
Technical data
Technical data
Indoor_2008_Chapter_12_LIS.indb 13 20-05-2008 14:32:58
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