Won't you guide my sleigh tonight?

RPI LRC Rudolph Graph

From Lighting Research Center at RPI some science to go along with the Rudolph the Red Nosed Reindeer story:

Interestingly, LRC research on perception under headlamp illumination of different colors under inclement weather like blowing snow confirms that the red color of Rudolph's nose was a very fortunate circumstance. LRC researchers John Bullough and Mark Rea measured peoples' ability to perform a driving task while looking through a simulated nighttime snowstorm. The headlights in that study could be red, yellow, white or blue-green, meaning people had to look through visual noise illuminated by different colors while performing the driving task. Performance was best under the red light and worst for the blue-green light. Bullough's and Rea's results showed that the light reflected by blowing snow when driving at night is least distracting when the color is red and that sensitivity to conditions like their simulated snowstorm may be influenced by rod photoreceptors in drivers' eyes, which are more sensitive to "blue" light and less sensitive to "red" light. In other words, the light from Rudolph's red nose could help make rooftops more visible by making blowing snow less visible!

And to think they used to laugh and call him names.

Looking forward to the "Rudolph" setting for the headlights on some future car.

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