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Colour Rendering Index of Compact Fluorescent Bulb
The colour temperature indicates the shade that the light source appears to our eyes.
If light sources are used to illuminate coloured objects, the colours of these objects appear different despite the same colour temperature of the light source. Such differences in quality are indicated by the colour rendering index Ra.
The colour rendering index is determined by a comparison with the standardised black body radiator which is defined as having the "ideal" colour rendering Ra of 100 at every temperature.
The greater the differences in colour between the comparison lamp and the black body radiator at the same colour temperature, the smaller the colour rendering index Ra.
Colour temperature and colour rendering are therefore needed to define the light colour of a lamp.
Note: Every colour temperature can have the ideal value of Ra 100. This means that the colours are rendered in the typical manner for this temperature. This is not always satisfactory, however. For example an incandescent lamp may render blue tones only in a subdued manner despite an Ra value of 99. If fine distinctions are required for blue tones a light colour with a higher colour temperature needs to be selected.
The Ra groups however provide a simple means of classifying light sources in different colour rendering quality levels:
Standard compact fluorescent lamps meet the requirements of colour rendering group 1B or colour rendering group 1A. Rules of thumb for selecting fluorescent lamps.
Tell you something about colour rendering index of compact fluorescent bulb.
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Compact Fluorescent Bulb
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