DT1384 datasheet(22/82 Pages) OSRAM

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2. Lamp data

Economical long-life light sources with plug-in bases.

Compact Fluorescent Lamps OSRAM DULUX®

Technical Guide

Note:

The colour perception of a non-luminous colour therefore always depends on the

colour temperature of the illuminating lamp and colour rendering properties of this

lamp.

Example:

Blue tones will always appear brighter in the light from a lamp with a daylight colour

than in the light from a lamp with a warm white colour, even if both lamps have an Ra

value of 100.

2.3

Photometric

data

2.3.1 Light colours

The light colours of the lamps are divided into three groups, each covering a particular

colour temperature range.

Light colour

Colour temperature

Daylight

> 5000 K

Cool White

3300 - 5000 K

Warm White

< 3300 K

The light colour is determined by the x and y coordinates in the chromaticity table.

For practical purposes, it is important to know the colour rendering properties of the

lamps in addition to their light colour and colour temperature. These properties are

defined by the (general) colour rendering index Ra.

The colour rendering index (computed using the CIE method) provides an indication of

how non-luminous colours will appear when illuminated by the relevant light source.

Colour rendering is assessed by comparison with a Planckian radiator (< 5000 K) and

normalised daylight (

≥ 5000 K) of the same colour temperature. By definition, these

radiators have the ideal colour rendering index of 100. Any deviation from this ideal is

rated with values lower than 100.

The general colour rendering index Ra is the average value of eight different internatio-

nally standardised test colours (CIE).

There are various ranges for the Ra value, known as colour rendering groups:

Ra value

Group

(according to DIN 5035)

90 - 100

Very good

80 - 89

Very good

70 -79

Good

60 - 69

Good

40 - 59

Satisfactory

20 - 39

Unsatisfactory

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