Which light source has the lowest CRI?

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Multiple Choice

Which light source has the lowest CRI?

Explanation:
Color rendering index (CRI) measures how accurately a light source reveals colors compared with a reference light. A higher CRI means colors look more natural under that light. High Pressure Sodium has the lowest CRI because it emits light from a very narrow range of wavelengths—mostly a strong yellow-orange from sodium lines—so many colors can’t be distinguished accurately and appear distorted. This limited spectrum yields a CRI in the low range, much lower than incandescent lighting, daylight, or most LEDs, which have broader spectra and render colors more faithfully.

Color rendering index (CRI) measures how accurately a light source reveals colors compared with a reference light. A higher CRI means colors look more natural under that light. High Pressure Sodium has the lowest CRI because it emits light from a very narrow range of wavelengths—mostly a strong yellow-orange from sodium lines—so many colors can’t be distinguished accurately and appear distorted. This limited spectrum yields a CRI in the low range, much lower than incandescent lighting, daylight, or most LEDs, which have broader spectra and render colors more faithfully.

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