OSRAM DULUX F - Manual (Page 39)

Economical long-life light sources with plug-in bases
Compact Fluorescent Lamps OSRAM DULUX ®
Technical Guide
37
Type Luminous flux (lm) for light colour
LUMILUX ® LUMILUX ® DE LUXE SPECIAL LIGHT COLOURS
880
SKY-
WHITE
865
Cool
Daylight
840
Cool
White
830
Warm
White
827
INTER-
NA
950
Daylight
940
Cool
White
930
Warm
White
60
Red
66
Green
67
Blue
OSRAM DULUX ® L 18W SP 1200 1200
OSRAM DULUX ® L 24W SP 1800 1800
OSRAM DULUX ® F 18W 1100 1100 1100
OSRAM DULUX ® F 24W 1705 1705 1705
OSRAM DULUX ® F 36W 2810 2810 2810
CFL SQUARE ® 16W 1050* 1050
CFL SQUARE ® 28W 2050* 2050
CFL SQUARE ® 38W 2735* 2735
*) Light colour 3500K
1) Also for CONSTANT models
2) Values for an ambient temperature of 25°C, maximum values at ambient temperature of 35°C
3) Also valid for XT models
2.3.5 Factors affecting colour consistency
There are a number of factors that affect colour consistency and the perception of the light colour of
compact fluorescent lamps.
Iridescence
Iridescence is a property of some anodised reflector finishes which results in a „rainbow“ effect
when use in conjunction with tri-chrome phosphors. Since all OSRAM DULUX
® lamps contain tri-
chrome phosphors, this effect caused by the reflector may be wrongly ascribed to the lamps as
„different light colours“.
Ambient temperature
The light colour of tri-chrome phosphors changes slightly as the ambient temperature changes
because of the relationship between luminous flux and temperature. This is apparent in applications
in which, say, open ceiling light fittings are installed close to air-condition outlets. In such cases, the
light colour may be slightly different from that of luminaires located further away. This effect can be
minimised by coordinating the air-conditioning system with the lighting system.
Manufacturing tolerances
There may be minimal differences in the light colours of lamps from different manufacturers. In
applications in which colour consistency is a critical factor, all the lamps in a particular zone should
come from the same manufacturer and should all be replaced together. If lamps are replaced indi-
vidually there may be differences in light colour.
Dimming
When fluorescent lamps are dimmed there is a slight reduction in colour temperature. The colour
temperature of a fully dimmed OSRAM DULUX
® L 36 W lamp, for example, is around 150 K lower
than that of an undimmed lamp. The colour difference appears greater to the eye due the consider-
able differences in luminance. Even greater differences may occur temporarily if there is a sharp
change in the dimmer setting (see 4.7 and 5.1.4).