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Why are all the street lights yellow?

Description:RegardlessofLED,thereareonlyafewtypesoflights,eachcorrespondingtoaspecificrangeofcolors.Toemitlightofanycolor,onecanonlyaddacoloredlampshadeinfrontofanincandescentlamp.Thishasalwaysbeenthecasefortrafficlights(untilLEDbecamepopular).Moststreetlightsareyellowbecausetheyusesodiumlamps(nowgenerallyhigh-pressuresodiumlamps),whichrelyonmetallicsodiumvaportoemitlight.Ifyouhavestudiedhighschoolchemistry,youshouldknowthespecificprinciplesofflamereaction,whichisbasicallythesamething.Highschoolphysicsalsoseemstotalkaboutelementalspectraandsoon.Ifyoudon'tknow,youcangotoofaronBaidu.Thenwhychoosesodiumlamps.Thereasonisalsoeasytothinkof,amongvarioustraditionalelectriclightsources,sodiumlampshavethehighestlightefficiency,orinotherwords,theyrequiretheleastamountofelectricitytogeneratethesameamountoflight.Meanwhile,thelifespanoflightbulbsisthelongest,reachingover20000hours.Italsomentionedtheissueofcolorrendering(althoughcolorrenderingisfarfromassimpleasmiddleschoolphysics).Sodiumlampsindeedhavepoorcolorrenderingperformance,butthecolorrenderingandlightefficiencyoftraditionallightsourcescannotbeachievedsimultaneously.Forexample,theincandescentlampwiththelowestlightefficiencyintheabovefigurehasthebestcolorrenderingperformanceamongthesetypesoflamps,andhigh-pressuresodiumlampshavebettercolorrenderingperformancethanlow-pressuresodiumlamps.Forstreetlights,themostimportantthingistoensurevisibilityofobjectsandensuretrafficsafety;Distinguishingcolorsisnotsoimportant,asitdoesn'tmakemuchdifferenceforpedestrianswhoareavoidingcarswhethertheoncomingcarisblackorred.Therefore,choosingsodiumlampswithhigherlightefficiencyandlongerlifespan,whichconsumethesameamountofelectricity,cancovermoreroadsurfacesandreducemaintenancecosts.Butthisdoesnotmeanthatcolorrenderingisnotimportant.Lowpressuresodiumlampsarecurrentlybeingphasedoutofthestreetlightindustry,mainlyduetopoorcolorrendering.WiththematurityofLEDlightsources,thelightefficiencyhasapproachedorevenexceededthatofhigh-pressuresodiumlamps.Inthefuture,withthefurtherdevelopmentoftechnology,thefieldofstreetlightswillgraduallybeoccupiedbyLEDlightsourceswithexcellentcolorrenderingWhatsApp86+13318250708www.hdxled.com
Description:RegardlessofLED,thereareonlyafewtypesoflights,eachcorrespondingtoaspecificrangeofcolors.Toemitlightofanycolor,onecanonlyaddacoloredlampshadeinfrontofanincandescentlamp.Thishasalwaysbeenthecasefortrafficlights(untilLEDbecamepopular).Moststreetlightsareyellowbecausetheyusesodiumlamps(nowgenerallyhigh-pressuresodiumlamps),whichrelyonmetallicsodiumvaportoemitlight.Ifyouhavestudiedhighschoolchemistry,youshouldknowthespecificprinciplesofflamereaction,whichisbasicallythesamething.Highschoolphysicsalsoseemstotalkaboutelementalspectraandsoon.Ifyoudon'tknow,youcangotoofaronBaidu.Thenwhychoosesodiumlamps.Thereasonisalsoeasytothinkof,amongvarioustraditionalelectriclightsources,sodiumlampshavethehighestlightefficiency,orinotherwords,theyrequiretheleastamountofelectricitytogeneratethesameamountoflight.Meanwhile,thelifespanoflightbulbsisthelongest,reachingover20000hours.Italsomentionedtheissueofcolorrendering(althoughcolorrenderingisfarfromassimpleasmiddleschoolphysics).Sodiumlampsindeedhavepoorcolorrenderingperformance,butthecolorrenderingandlightefficiencyoftraditionallightsourcescannotbeachievedsimultaneously.Forexample,theincandescentlampwiththelowestlightefficiencyintheabovefigurehasthebestcolorrenderingperformanceamongthesetypesoflamps,andhigh-pressuresodiumlampshavebettercolorrenderingperformancethanlow-pressuresodiumlamps.Forstreetlights,themostimportantthingistoensurevisibilityofobjectsandensuretrafficsafety;Distinguishingcolorsisnotsoimportant,asitdoesn'tmakemuchdifferenceforpedestrianswhoareavoidingcarswhethertheoncomingcarisblackorred.Therefore,choosingsodiumlampswithhigherlightefficiencyandlongerlifespan,whichconsumethesameamountofelectricity,cancovermoreroadsurfacesandreducemaintenancecosts.Butthisdoesnotmeanthatcolorrenderingisnotimportant.Lowpressuresodiumlampsarecurrentlybeingphasedoutofthestreetlightindustry,mainlyduetopoorcolorrendering.WiththematurityofLEDlightsources,thelightefficiencyhasapproachedorevenexceededthatofhigh-pressuresodiumlamps.Inthefuture,withthefurtherdevelopmentoftechnology,thefieldofstreetlightswillgraduallybeoccupiedbyLEDlightsourceswithexcellentcolorrenderingWhatsApp86+13318250708www.hdxled.com
Information

Regardless of LED, there are only a few types of lights, each corresponding to a specific range of colors. To emit light of any color, one can only add a colored lampshade in front of an incandescent lamp. This has always been the case for traffic lights (until LED became popular).

Most street lights are yellow because they use sodium lamps (now generally high-pressure sodium lamps), which rely on metallic sodium vapor to emit light. If you have studied high school chemistry, you should know the specific principles of flame reaction, which is basically the same thing. High school physics also seems to talk about elemental spectra and so on. If you don't know, you can go too far on Baidu.

Then why choose sodium lamps. The reason is also easy to think of, among various traditional electric light sources, sodium lamps have the highest light efficiency, or in other words, they require the least amount of electricity to generate the same amount of light.

Meanwhile, the lifespan of light bulbs is the longest, reaching over 20000 hours.

It also mentioned the issue of color rendering (although color rendering is far from as simple as middle school physics).

Sodium lamps indeed have poor color rendering performance, but the color rendering and light efficiency of traditional light sources cannot be achieved simultaneously. For example, the incandescent lamp with the lowest light efficiency in the above figure has the best color rendering performance among these types of lamps, and high-pressure sodium lamps have better color rendering performance than low-pressure sodium lamps.

For street lights, the most important thing is to ensure visibility of objects and ensure traffic safety; Distinguishing colors is not so important, as it doesn't make much difference for pedestrians who are avoiding cars whether the oncoming car is black or red. Therefore, choosing sodium lamps with higher light efficiency and longer lifespan, which consume the same amount of electricity, can cover more road surfaces and reduce maintenance costs.

But this does not mean that color rendering is not important. Low pressure sodium lamps are currently being phased out of the street light industry, mainly due to poor color rendering.

With the maturity of LED light sources, the light efficiency has approached or even exceeded that of high-pressure sodium lamps. In the future, with the further development of technology, the field of street lights will gradually be occupied by LED light sources with excellent color rendering

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