Dear Supporters,

A supporter sent me a link to this May, 2023 research article today (https://www.frontiersin.org/articles/10.3389/fphy.2023.1181343/full).  This research article is unequivocal mathematical proof that LED light is similar to laser light.  The research article uses the term "spatially partially coherent."

Here is some information about laser safety from the University of South Carolina (https://sc.edu/about/offices_and_divisions/ehs/research_and_laboratory_safety/radiation_safety/coherent_light_lasers/index.php).  Quote: "Coherent Light – LasersLasers generate coherent, monochromatic light in many wavelengths, both visible and invisible, depending on the type of laser. The property of coherence makes lasers very different than typical light sources; and very hazardous to the eyes and/or skin. The properties of coherence makes lasers hazardous even at very low powers. Some lasers operating at a power of just a few milliWatts (mW) or less can cause instantaneous damage to the eye and/or skin if exposed. Because laser light is monochromatic and coherent, the distances with which lasers can be hazardous are quite long; typically miles long."  This information is EXACTLY the same information as in the May, 2023 research article on spatially partially coherent LED light. The distance at which LED light is dangerous is very long, no different than lasers!

The pain that you have been experiencing from LED headlights has now been mathematically proven.  LED light is spatially coherent in the center of the beam and can injure your eyes, even at long distances.  Laser light has regulations.  LED headlights have no regulations.

Tell your members of Congress that you don't want spatially coherent LED headlights damaging your eyes and that you demand that the automakers return to using spatially incoherent light like the tungsten filaments they used to use.

Sincerely,

Mark Baker
President
Soft Lights Foundation
www.softlights.org
mbaker@softlights.org