Which lamp has the best Colour Rendering Index (CRI)?

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ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 2
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  1. Fluorescent
  2. Incandescent
  3. LED
  4. High-pressure sodium vapor

Answer (Detailed Solution Below)

Option 2 : Incandescent
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  • The most useful measure of a light source's color characteristics is the colour rendering index (CRI).
  • CRI is a measure of a light source's ability to show object colors "realistically" or "naturally" compared to a familiar reference source, either incandescent light or daylight.
  • The color rendering index (CRI) is measured as a number between 0 and 100.
  • At zero (0), all the colours look the same.
  • A CRI of 100 shows the true colors of the object.
  • Incandescent and halogen light sources have a CRI of 100.
  • Typically, light sources with a CRI of 80 to 90 are regarded as good and those with a CRI of 90+ are excellent.
  • Higher the CRI, the better the color rendering capacity.
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