The Claim

Cool white LED and cool white compact fluorescent (CFL) lamps have a higher potential to suppress melatonin compared to warm white LED, warm white CFL, and incandescent lamps, as determined by their spectral output and calculated melatonin suppression values (MSV), with median MSVs of 12.3% and 12.1% for cool white LED and CFL respectively, 3.6% and 2.6% for warm white LED and CFL, and 1.5% for incandescent lamps, indicating that lamp color temperature and lighting technology significantly influence the circadian impact of residential lighting.

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

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
43score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Quantitative
1 study reviewed
In plain English

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.

See the scientific wording

Cool white LED and cool white compact fluorescent (CFL) lamps have a higher potential to suppress melatonin compared to warm white LED, warm white CFL, and incandescent lamps, based on their spectral output and calculated melatonin suppression values (MSV). Specifically, cool white LEDs and CFLs show median MSVs of 12.3% and 12.1%, respectively, while warm white LEDs and CFLs show 3.6% and 2.6%, and incandescent lamps show only 1.5%. This indicates that lamp color temperature and technology significantly influence the circadian impact of residential lighting.

What the research says

1 study

  1. Study: Home lighting, blue-light filtering, and their effects on melatonin suppression

    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.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

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