Cool white light bulbs, like some LEDs and CFLs, might mess with your sleep more than warm yellowish ones because they can reduce a sleep hormone called melatonin more strongly.

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Pro

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Against

Evidence from Studies

Supporting (1)

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Community contributions welcome

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Home lighting, blue-light filtering, and their effects on melatonin suppression

Cross-Sectional Study

2026 Jan 21

The study found that cool white LED and CFL lights reduce melatonin more than warm white or incandescent bulbs, just like the claim says, because they give off more blue light at night.

Contradicting (0)

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No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Home lighting, blue-light filtering, and their effects on melatonin suppression

Score: 43

DOI: 10.1038/s41598-025-29882-7

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