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Circadian Rhythm Light Bulbs: The Buyer’s Guide That Works

“Choose a warm-white bulb for better sleep” is common advice, but it’s not a reliable buying rule. A bulb’s color temperature doesn’t tell you how much circadian-active light reaches your eyes. Spectrum, brightness, timing, and viewing position all matter. A warm-looking light can still deliver a meaningful biological signal when it’s bright, close, or used

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