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2: Overview
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Visible Yellow
Visible Yellow
Wavelength: 0.5770 (yellow of Mercury street lamp)
Energy per photon: 2.2 electron volts
Harmful Effects: Normally harmless, but can cause blindness or burn tissue at high intensity (from the Sun or a laser).

Emitted by:

  • The Sun
  • Incandescent light bulbs
  • Fluorescent light bulbs
  • Outdoor lighting: high-pressure or sodium low-pressure
  • sodium lights
  • Car lights such as halogen lights
Human eye
Image courtesy of St. Lukes Cataract and Laser Institute.

Detected by:

  • Cameras (film or digital)
  • The human eye
  • Animal eyes
  • Astronomical instruments, including telescopes


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