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The magic eye (also called a cat's eye, or tuning eye in North America) is a specific type of such a tube with a circular display similar to the EM34 illustrated. Its first broad application was as a tuning indicator in radio receivers , to give an indication of the relative strength of the received radio signal, to show when a radio station ...
The frequency of light used in the definition corresponds to a wavelength in a vacuum of 555 nm, which is near the peak of the eye's response to light. If the 1 candela source emitted uniformly in all directions, the total radiant flux would be about 18.40 mW, since there are 4 π steradians in a sphere.
The term cat's eye derives from the resemblance of the cat's eye retroreflector to the optical system that produces the well-known phenomenon of "glowing eyes" or eyeshine in cats and other vertebrates (which are only reflecting light, rather than actually glowing).
Red PCY16W PU20d-2 1 12 V: 16 W Amber PR19W PGU20-5 1 12 V: 19 W Red PY19W PGU20-2 1 12 V: 19 W Amber PSR19W PG20-5 1 12 V: 19 W Red PSR24W PG20-6 1 12 V: 24 W Red PR24W PGU20-6 1 12 V: 24 W Red R2 P45t 2 6 V & 12 V: 45 / 40 W 24 V: 55 / 50 W Standard and higher-wattage versions available with halogen burner S1 BA20d 2 6 V & 12 V: 25 / 25 W
US Military marker lights are designed with a series of "cat eyes" that appear differently depending on the distance one is away from the vehicle that is equipped with the lights. When the following distance is too far the rear marker lights appear as a single red light and when too close as four separate red lights.
The luminous flux accounts for the sensitivity of the eye by weighting the power at each wavelength with the luminosity function, which represents the eye's response to different wavelengths. The luminous flux is a weighted sum of the power at all wavelengths in the visible band. Light outside the visible band does not contribute.
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