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The "color temperature" of light bulbs is typically measured on the Kelvin scale (symbol K) of absolute temperature. Bulbs with a rating of 5,000K give off a "cool" bright bluish white light which some complain is too harsh or institutional-looking. Bulbs with a lower rating (about 2,700K or 3,000K) give off a "warmer" yellowish light wish some complain is inadequate or spectrum-shifting.

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13y ago

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