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LED light research

LED light research

T194/0850

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Credit

ANDREW BROOKES, NATIONAL PHYSICAL LABORATORY / SCIENCE PHOTO LIBRARY ANDREW BROOKES, NATIONAL PHYSICAL LABORATORY / SCIENCE PHOTO LIBRARY

Caption

LED light research. Apparent source size measurement facility being used to measure a beam of light from an LED (light emitting diode). The LED's 'apparent source size' is not the size of the LED device itself but the diameter of the light beam projected on the retina (back of the eye) after it has passed through the focusing parts of the eye. The lenses here are representing the focusing parts of the eye in order to check the optical safety of the LED. Other LED safety tests include looking at the radiance (brightness) and the spectral characteristics (the type of light emitted). Photographed at the National Physical Laboratory in Teddington, UK.

Release details

Model release not required. Property release not required.

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