The CRI refers to the Colour
Rendering Index (sometimes referred to as Colour Accuracy). This is the level to which a light source can duplicate colors
produced by a reference light source (usually the sun). It is measured as a
number between 0 and 100. A light fixture with CRI of 100 means that colours
will appear exactly as they would under normal midday sunlight conditions, like
an incandescent or halogen bulb.
A CRI of 80 means that the LED
light bulb is replicating 80% of the visible color spectrum that the sun would
produce at the same colour temperature. A CRI of 100, taken at a colour
temperature of midday sunlight will exactly reproduce the colours found on a
sunny day at noon. A CRI of 50 taken at midday sun will somewhat reproduce the
colours when compared to that of a normal midday sunlight.
Some manufacturers (in a bid to attain a CRI of 100) use a non-midday colour temperature as their source CRI, therefore when calculating the CRI of their fixtures; it appears higher than it actually is (and therefore more impressive).
Currently (using the midday Sun
as our light source) Astera’s SpotMax™ can achieve a CRI of approximately 87,
which is incredibly high for a wireless, RGBAW fixture. A CRI of between 90 and
95 is achievable with an LED light source, but as yet is not commercially
available.
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