Gaginh0 je napisao:I sta po ovome ispada, da su zelena i zuta naj oseltjivije, tj da najvise smetaju?
Ne, to ti znaci da je na primer mnogo lakse osvetliti nesto izvorom svetlosti iste snage zute ili zelene nego plave ili recimo crvene ili ljubicaste boje. Npr. da imas sijalicu od 100W zelenu i ljubicastu imao bi utisak boljeg osvetljenja sa zelenom sijalicom. Zuta se upravo koristi jer je prijatna za oko, pa tako i u uslovima smanjene vidljivosti, jer bela svetlost sadrzi i odredjenu kolicinu plave.
What explains the persistent subjective preference amongst experienced poor-weather drivers for yellow fog lamps, despite decades of white fog lamp prevalence? Selective yellow light can improve a driver's ability to see in fog or rain or snow, but not because it 'penetrates fog better' or 'reflects less off droplets' as is commonly thought. That effect is known as Rayleigh Scattering, and is why the sky appears blue. However, it occurs only when the droplet size is equal or smaller than the wavelength of the light, which is certainly not the case with ordinary fog, rain or snow. Roadway Fog droplets are several orders of magnitude larger than visible light wavelengths, so there's no Rayleigh Scattering.
So, why do yellow fog lamps seem to work better? It's because of the way the human eye interacts with different colors of light. Blue and violet are very difficult for the human optical system to process correctly. They are the shortest visible wavelengths and tend to focus in front of our eyes' retinae, rather than upon it. To demonstrate this to yourself, find a dark blue store front sign or something else that's a dark, pure blue against a dark background in the absence of white light—from any appreciable distance, it's almost impossible for your eyes to see the blue lighted object as a sharply defined form;the edges blur significantly. Deep blue runway lights exhibit the same effect; check it out the next time you land at night.
Blue also is a very difficult color of light to look at; it stimulates the reaction we call glare. Within the range of allowable white light, bluer headlamps have been shown to be 46% more glaring than yellower ones for a given intensity of light — see studies here and here. So, it seems culling the blue out of the spectrum lightens the optical workload and reduces glare. For a more detailed examination of this effect with respect to driving in foul weather, see Bullough & Rea's study on the topic.
http://www.danielsternlighting.com/tech ... color.html
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