Photochromic light lens

Details Photochromic light lens Photochromic light lens

1978-07-13

1981-12-22

Sikes, William L.

G02F 117

Patent

active

043067727

ABSTRACT:
A negative photochromic material which is responsive to the ultraviolet portion of the daylight spectrum comprises part of the lens of a light fixture. The material which is of the normally dark type varies the translucence of the lens so that more lumens of light are transmitted through the lens under daylight lighting conditions than at night.

REFERENCES:
patent: 3365678 (1968-01-01), Maurer
Photochromism, ed. Brown, Wiley-Interscience (1971), p. 308.

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