How comparisons and evidence labels work

Ranking inputs

Products are compared using transparent sub-scores: value, light data confidence, wavelength match, coverage, buyer protection, and technical completeness.

Affiliate availability is a launch inclusion constraint. It is not a scoring input.

Irradiance confidence

1. Independent test
2. Manufacturer lab report
3. Manufacturer claim
4. Marketplace claim
5. Unknown

Evidence labels

Evidence pages use plain-language grades: high, moderate, low, very low, and indirect. Each study also receives a panel-relevance label so readers can see whether a protocol resembles consumer panel use.