The higher the cri of a bulb the closer it is to representing the full spectrum of visible light.
Sunlight spectrum light bulbs.
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According to recent studies the color rendering index of sunlight light bulbs is more than 80 which is considered good for reflecting colors naturally.
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The color rendering index cri and the color temperature measure the quality of the emitted spectrum.
The term full spectrum was essentially made up by light bulb companies as a way to distinguish products that illuminate all colors from bulbs with a more limited range like soft white or cool white they are called this because in most cases they are designed to highlight and intensify colors across the spectrum from neutral to warm to cool much as the sun does.
Sunlight light bulbs resemble well balanced natural sunlight with similar a wavelength spectrum and unlike traditional bulbs bring advantages of natural sunlight for humans.
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Sunlight light bulbs are designed to reproduce the visible portion of the sunlight spectrum including some portions of infrared and ultraviolet wavelengths.
The cfls come in four wattages 15 wt 25 wt 30 wt and a 3 way bulb.
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Full spectrum light bulbs.
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But sunlight lamps can never exactly match the solar spectrum.
Instead they can only produce approximate sunlight spectra.
The closest we can come to measuring this is with cri color rendering index on a scale of 0 100.
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True balanced full spectrum light a pilot study showed a 22 79 increase in the immune system in 30 days when people put indoor sunshine lights where they wanted to and used them when they wanted to.
80 cri is a fairly common cri in household bulbs.