Innovative roadway light source and dye combinations to improve visibility and reduce environmental impacts.
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2013-04-01
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NTL Classification:NTL-ENERGY AND ENVIRONMENT-ENERGY AND ENVIRONMENT;NTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATION;
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Abstract:Sky glow light pollution is caused largely by reflected light off of roadway and other surfaces. The
authors investigated the feasibility of a system consisting of a specialized LED streetlight and a dyebased
roadway surface coating that would reduce sky glow, but still provide adequate illumination of
objects in the road. As envisioned, the streetlight would produce white light with narrow-band LEDs of
red, green, and blue wavelengths. The roadway surface coating would use three dyes that would
selectively absorb the specific wavelengths produced by the streetlight. This investigation examined the
optical properties of green and blue absorbing dyes. The dyes, when in their liquid states, did selectively
absorb light at the expected wavelengths. However, the dyes did not selectively absorb light when
applied as a surface coating, so appropriate encapsulants would need to be developed for subsequent
implementation. Also, issues of stability over time, cost, and safety were identified. A number of
significant hurdles would need to be overcome before this could become a practical method of reducing
sky glow from roadway illumination systems.
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