{"id":5347,"date":"2024-09-24T14:04:08","date_gmt":"2024-09-24T06:04:08","guid":{"rendered":"https:\/\/old.luxificlighting.com\/?p=5347"},"modified":"2025-02-20T15:07:25","modified_gmt":"2025-02-20T07:07:25","slug":"why-are-street-lights-purple","status":"publish","type":"post","link":"https:\/\/old.luxificlighting.com\/pt\/blogs\/why-are-street-lights-purple\/","title":{"rendered":"Porque \u00e9 que os candeeiros de rua s\u00e3o roxos?"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">J\u00e1 alguma vez viu um candeeiro de rua LED roxo do outro lado da estrada? Durante algum tempo, pode parecer elegante e est\u00e9tico. Mas podem ser perigosos tanto para os condutores como para os pe\u00f5es. Al\u00e9m disso, como \u00e9 que isto pode levantar muitas vezes a quest\u00e3o: Porque \u00e9 que os candeeiros de rua s\u00e3o roxos? Eis uma explica\u00e7\u00e3o r\u00e1pida da quest\u00e3o.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Em 2007, foi anunciado que a cidade de Ann Arbor foi a primeira cidade americana a mudar de l\u00e2mpadas de vapor de s\u00f3dio para LED. Mais tarde, muitos pa\u00edses americanos come\u00e7aram a mudar para candeeiros de rua LED. Isto n\u00e3o s\u00f3 eliminou a irritante tonalidade amarela das ruas, como tamb\u00e9m trouxe uma ilumina\u00e7\u00e3o LED clara e brilhante. Ultimamente, os EUA e o mundo t\u00eam observado um novo e estranho fen\u00f3meno de cor nocturna. H\u00e1 relatos de postes de ilumina\u00e7\u00e3o p\u00fablica de aspeto p\u00farpura a aparecer nas ruas americanas.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Al\u00e9m disso, estas luzes de rua ficam subitamente roxas. Este facto n\u00e3o s\u00f3 assusta as pessoas, como tamb\u00e9m representa um risco para a sa\u00fade durante a condu\u00e7\u00e3o. Quais s\u00e3o as raz\u00f5es por detr\u00e1s disto? Porque \u00e9 que as luzes de rua LED s\u00e3o roxas? Aqui est\u00e1 um blogue que discute em pormenor tudo sobre as luzes LED e a sua cor p\u00farpura.<\/span><\/p>\n\t<section class=\"section\" id=\"section_231549781\">\n\t\t<div class=\"bg section-bg fill bg-fill  bg-loaded\" >\n\n\t\t\t\n\t\t\t\n\t\t\t\n\n\t\t<\/div>\n\n\t\t\n\n\t\t<div class=\"section-content relative\">\n\t\t\t\n<div class=\"row\"  id=\"row-1762676179\">\n\n\t<div id=\"col-1658736822\" class=\"col small-12 large-12\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<div class=\"container section-title-container\" ><h2 class=\"section-title section-title-normal\"><b><\/b><span class=\"section-title-main\" >Mas primeiro, como funcionam os candeeiros de rua LED brancos<\/span><b><\/b><\/h2><\/div>\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_441150004\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner image-cover dark\" style=\"padding-top:75%;\">\n\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"750\" src=\"https:\/\/old.luxificlighting.com\/wp-content\/uploads\/2023\/09\/LED_street_lights.webp\" class=\"attachment-large size-large\" alt=\"LED street lights\" srcset=\"https:\/\/old.luxificlighting.com\/wp-content\/uploads\/2023\/09\/LED_street_lights.webp 1000w, https:\/\/old.luxificlighting.com\/wp-content\/uploads\/2023\/09\/LED_street_lights-300x225.webp 300w, https:\/\/old.luxificlighting.com\/wp-content\/uploads\/2023\/09\/LED_street_lights-768x576.webp 768w, https:\/\/old.luxificlighting.com\/wp-content\/uploads\/2023\/09\/LED_street_lights-500x375.webp 500w, https:\/\/old.luxificlighting.com\/wp-content\/uploads\/2023\/09\/LED_street_lights-800x600.webp 800w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_441150004 {\n  width: 50%;\n}\n<\/style>\n\t<\/div>\n\t\n<p><span style=\"font-weight: 400;\">Antes de compreender o fen\u00f3meno da p\u00farpura, vamos primeiro compreender como funcionam os candeeiros de rua LED brancos. Isto pode surpreend\u00ea-lo, mas o LED nunca produz luz de cor branca. Os candeeiros de rua modernos funcionam com d\u00edodos emissores de luz. Os d\u00edodos podem emitir luz em diferentes comprimentos de onda, exceto na cor branca. Assim, a cor branca que vemos \u00e9 uma mistura de duas ou mais luzes que, em conjunto, aparecem como brancas. Existem dois m\u00e9todos pelos quais as luzes LED produzem luz branca:<\/span><\/p>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row\"  id=\"row-1310626844\">\n\n\t<div id=\"col-588344747\" class=\"col small-12 large-12\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<div class=\"container section-title-container\" ><h3 class=\"section-title section-title-normal\"><b><\/b><span class=\"section-title-main\" >M\u00e9todo 1: Utilizar LEDs vermelhos, verdes e azuis<\/span><b><\/b><\/h3><\/div>\n<p><span style=\"font-weight: 400;\">Em geral, os LEDs que emitem vermelho, verde ou azul combinam-se numa \u00fanica luz branca. No entanto, a gera\u00e7\u00e3o de luz vermelha e verde requer mais energia do que outras op\u00e7\u00f5es.<\/span><\/p>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row\"  id=\"row-1898959533\">\n\n\t<div id=\"col-1835490404\" class=\"col small-12 large-12\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<div class=\"container section-title-container\" ><h3 class=\"section-title section-title-normal\"><b><\/b><span class=\"section-title-main\" >M\u00e9todo 2: Combina\u00e7\u00e3o de LED azul e revestimento de f\u00f3sforo<\/span><b><\/b><\/h3><\/div>\n<p><span style=\"font-weight: 400;\">Outro m\u00e9todo envolve a utiliza\u00e7\u00e3o de LEDs azuis revestidos com f\u00f3sforo fluorescente. Estes absorvem comprimentos de onda azuis e emitem comprimentos de onda vermelhos e amarelos, resultando num feixe branco. A maioria das marcas de LED segue o segundo m\u00e9todo, uma vez que \u00e9 mais econ\u00f3mico e eficiente em termos energ\u00e9ticos.<\/span><\/p>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row\"  id=\"row-976777296\">\n\n\t<div id=\"col-422982918\" class=\"col small-12 large-12\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<div class=\"container section-title-container\" ><h2 class=\"section-title section-title-normal\"><b><\/b><span class=\"section-title-main\" >Porque \u00e9 que o LED fica roxo de vez em quando?<\/span><b><\/b><\/h2><\/div>\n<p><span style=\"font-weight: 400;\">Agora vem a quest\u00e3o principal: porque \u00e9 que as luzes da rua s\u00e3o roxas? Porque \u00e9 que as luzes LED brancas mudam subitamente para roxo? Haver\u00e1 um milagre ou ci\u00eancia por detr\u00e1s disso? A raz\u00e3o exacta por detr\u00e1s deste fen\u00f3meno ainda \u00e9 desconhecida. E nem todos os candeeiros de rua se transformam num tom p\u00farpura vibrante. No entanto, a hip\u00f3tese cient\u00edfica sugere que a camada de f\u00f3sforo delaminada \u00e0 volta da l\u00e2mpada pode causar uma luz p\u00farpura brilhante. Em palavras simples, a camada de f\u00f3sforo descascada exp\u00f5e a luz azul do LED por baixo. Embora seja de cor azul profunda, tamb\u00e9m tem uma tonalidade violeta que se desvia mais. Assim, em vez de um espetro branco brilhante, a luz violeta \u00e9 transmitida atrav\u00e9s das l\u00e2mpadas. Noutros casos, pode dever-se a um mau funcionamento ou a luzes LED danificadas.<\/span><\/p>\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_949640244\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner image-cover dark\" style=\"padding-top:75%;\">\n\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"750\" src=\"https:\/\/old.luxificlighting.com\/wp-content\/uploads\/2024\/09\/why_are_led_street_lights_purple.webp\" class=\"attachment-large size-large\" alt=\"why are led street lights purple\" srcset=\"https:\/\/old.luxificlighting.com\/wp-content\/uploads\/2024\/09\/why_are_led_street_lights_purple.webp 1000w, https:\/\/old.luxificlighting.com\/wp-content\/uploads\/2024\/09\/why_are_led_street_lights_purple-300x225.webp 300w, https:\/\/old.luxificlighting.com\/wp-content\/uploads\/2024\/09\/why_are_led_street_lights_purple-768x576.webp 768w, https:\/\/old.luxificlighting.com\/wp-content\/uploads\/2024\/09\/why_are_led_street_lights_purple-16x12.webp 16w, https:\/\/old.luxificlighting.com\/wp-content\/uploads\/2024\/09\/why_are_led_street_lights_purple-500x375.webp 500w, https:\/\/old.luxificlighting.com\/wp-content\/uploads\/2024\/09\/why_are_led_street_lights_purple-800x600.webp 800w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_949640244 {\n  width: 50%;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row\"  id=\"row-1431326522\">\n\n\t<div id=\"col-1188142694\" class=\"col small-12 large-12\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<div class=\"container section-title-container\" ><h3 class=\"section-title section-title-normal\"><b><\/b><span class=\"section-title-main\" >Quais s\u00e3o as raz\u00f5es por detr\u00e1s da delamina\u00e7\u00e3o do f\u00f3sforo nos postes de ilumina\u00e7\u00e3o p\u00fablica LED?<\/span><b><\/b><\/h3><\/div>\n<p><span style=\"font-weight: 400;\">Agora que j\u00e1 sabe a resposta: porque \u00e9 que os candeeiros de rua s\u00e3o roxos? Poder\u00e1 estar a perguntar-se quais s\u00e3o as raz\u00f5es por detr\u00e1s da delamina\u00e7\u00e3o nos candeeiros de rua LED. Bem, pode haver muitas raz\u00f5es para isso. Aqui est\u00e1 a lista de factores que podem provocar a delamina\u00e7\u00e3o das luzes LED:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Funcionamento cont\u00ednuo ou funcionamento dos LEDs<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Acumula\u00e7\u00e3o de calor no interior do aparelho de ilumina\u00e7\u00e3o<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Vibra\u00e7\u00f5es dos carros que passam<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A gravidade que afecta a camada de f\u00f3sforo<\/span><\/li>\n<\/ul>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row\"  id=\"row-1204368267\">\n\n\t<div id=\"col-1270171920\" class=\"col small-12 large-12\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<div class=\"container section-title-container\" ><h2 class=\"section-title section-title-normal\"><b><\/b><span class=\"section-title-main\" >O efeito da luz p\u00farpura<\/span><b><\/b><\/h2><\/div>\n<p><span style=\"font-weight: 400;\">As raz\u00f5es por detr\u00e1s do p\u00farpura berrante dos LEDs ainda n\u00e3o s\u00e3o claras. Mas isso d\u00e1 origem a outra quest\u00e3o: quais s\u00e3o os efeitos da luz p\u00farpura? Como \u00e9 que ela afecta os condutores e os pe\u00f5es, ou \u00e9 prejudicial? Obviamente, a luz p\u00farpura tem uma frequ\u00eancia diferente e pode afetar os fotorreceptores. Os olhos humanos s\u00e3o compostos por dois tipos de fotorreceptores - cones e bastonetes.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">O cone funciona em condi\u00e7\u00f5es de luminosidade e os bastonetes em condi\u00e7\u00f5es de fraca luminosidade. Mas os bastonetes s\u00e3o mais sens\u00edveis \u00e0 luz azul e n\u00e3o conseguem detetar outras cores. Assim, torna-se mais dif\u00edcil para os humanos focarem-se na luz p\u00farpura devido \u00e0 limita\u00e7\u00e3o dos cones sens\u00edveis ao azul no olho. A limita\u00e7\u00e3o dos bastonetes tamb\u00e9m pode dificultar a diferencia\u00e7\u00e3o das cores. Tudo pode parecer azul ou preto, o que pode ser arriscado durante a condu\u00e7\u00e3o.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ao mesmo tempo, ao contr\u00e1rio da luz branca brilhante, a luz p\u00farpura pode reduzir o brilho l\u00edquido. Torna as ruas mais sombrias e escuras, afectando a visibilidade e a seguran\u00e7a dos condutores e dos pe\u00f5es. A cor p\u00farpura da luz de rua afecta n\u00e3o s\u00f3 os seres humanos, mas tamb\u00e9m os animais. Insectos como as tra\u00e7as e outros insectos noturnos s\u00e3o atra\u00eddos pela luz azul e p\u00farpura. Esta luz perturba o seu padr\u00e3o de comportamento natural e causa problemas no seu estilo de vida. Al\u00e9m disso, esta luz pode ser fatal para polinizadores, morcegos e corujas. Assim, a longo prazo, pode alterar os ecossistemas locais.<\/span><\/p>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row\"  id=\"row-1198900995\">\n\n\t<div id=\"col-628647657\" class=\"col small-12 large-12\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<div class=\"container section-title-container\" ><h3 class=\"section-title section-title-normal\"><b><\/b><span class=\"section-title-main\" >Haver\u00e1 alguma forma de reduzir o impacto dos candeeiros de ilumina\u00e7\u00e3o p\u00fablica de cor p\u00farpura?<\/span><b><\/b><\/h3><\/div>\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_423168976\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner image-cover dark\" style=\"padding-top:75%;\">\n\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"750\" src=\"https:\/\/old.luxificlighting.com\/wp-content\/uploads\/2024\/09\/purple_street_lights_.webp\" class=\"attachment-large size-large\" alt=\"purple street lights\" srcset=\"https:\/\/old.luxificlighting.com\/wp-content\/uploads\/2024\/09\/purple_street_lights_.webp 1000w, https:\/\/old.luxificlighting.com\/wp-content\/uploads\/2024\/09\/purple_street_lights_-300x225.webp 300w, https:\/\/old.luxificlighting.com\/wp-content\/uploads\/2024\/09\/purple_street_lights_-768x576.webp 768w, https:\/\/old.luxificlighting.com\/wp-content\/uploads\/2024\/09\/purple_street_lights_-16x12.webp 16w, https:\/\/old.luxificlighting.com\/wp-content\/uploads\/2024\/09\/purple_street_lights_-500x375.webp 500w, https:\/\/old.luxificlighting.com\/wp-content\/uploads\/2024\/09\/purple_street_lights_-800x600.webp 800w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_423168976 {\n  width: 50%;\n}\n<\/style>\n\t<\/div>\n\t\n<p><span style=\"font-weight: 400;\">Eis algumas formas de reduzir o impacto dos candeeiros de ilumina\u00e7\u00e3o p\u00fablica de cor p\u00farpura:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Substituir o mais rapidamente poss\u00edvel as l\u00e2mpadas avariadas e com defeito.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Mude para LEDs de cor \u00e2mbar em vez de luzes brancas brilhantes.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Evitar usar \u00f3culos de sol \u00e0 noite.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ignorar os \u00f3culos de filtragem de luz azul \u00e0 noite.<\/span><\/li>\n<\/ul>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row\"  id=\"row-1963235809\">\n\n\t<div id=\"col-1238083614\" class=\"col small-12 large-12\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<div class=\"container section-title-container\" ><h3 class=\"section-title section-title-normal\"><b><\/b><span class=\"section-title-main\" >O que fazer quando vir uma luz LED roxa<\/span><b><\/b><\/h3><\/div>\n<p><span style=\"font-weight: 400;\">Quando avistar uma luz LED p\u00farpura ao atravessar a rua a p\u00e9 ou de carro, tenha cuidado. Pode afetar a qualidade da vis\u00e3o ou causar outros riscos para a sa\u00fade. Tamb\u00e9m pode tentar contactar os operadores sobre as luzes avariadas. Eles vir\u00e3o reparar a luz em breve para restaurar a sua cor original.<\/span><\/p>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row\"  id=\"row-2100051211\">\n\n\t<div id=\"col-1470309336\" class=\"col small-12 large-12\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<div class=\"container section-title-container\" ><h2 class=\"section-title section-title-normal\"><b><\/b><span class=\"section-title-main\" >Pensamentos finais<\/span><b><\/b><\/h2><\/div>\n<p><span style=\"font-weight: 400;\">As luzes de rua LED s\u00e3o uma tecnologia avan\u00e7ada que revolucionou o jogo global. S\u00e3o dur\u00e1veis e vers\u00e1teis e iluminam as ruas da melhor maneira poss\u00edvel. Mas nenhuma tecnologia pode ser alargada sem limita\u00e7\u00f5es, e as luzes roxas s\u00e3o uma dessas limita\u00e7\u00f5es que podem ser prejudiciais.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Embora a solu\u00e7\u00e3o exacta n\u00e3o esteja no mercado neste momento, uma coisa \u00e9 certa. Porque \u00e9 que os candeeiros de rua s\u00e3o roxos? Esperamos que agora saiba a resposta a esta pergunta. Outra coisa \u00e9 que a ci\u00eancia e a tecnologia est\u00e3o a revolucionar-se todos os dias. Assim, \u00e9 necess\u00e1rio preocupar-se com esta quest\u00e3o a longo prazo. \u00c0 medida que o mercado de LEDs avan\u00e7a em dire\u00e7\u00e3o \u00e0 efici\u00eancia e \u00e0 acessibilidade, em breve haver\u00e1 uma solu\u00e7\u00e3o permanente. Em termos simples, o fen\u00f3meno da ilumina\u00e7\u00e3o p\u00farpura \u00e9 apenas um contratempo que se tornar\u00e1 mais uma mem\u00f3ria nos pr\u00f3ximos tempos. At\u00e9 l\u00e1, tenha cuidado e conduza com seguran\u00e7a!<\/span><\/p>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>\n\t\t<\/div>\n\n\t\t\n<style>\n#section_231549781 {\n  padding-top: 0px;\n  padding-bottom: 0px;\n}\n#section_231549781 .ux-shape-divider--top svg {\n  height: 150px;\n  --divider-top-width: 100%;\n}\n#section_231549781 .ux-shape-divider--bottom svg {\n  height: 150px;\n  --divider-width: 100%;\n}\n<\/style>\n\t<\/section>","protected":false},"excerpt":{"rendered":"<p>J\u00e1 alguma vez viu um candeeiro de rua LED roxo do outro lado da estrada? Durante algum tempo, pode parecer elegante e est\u00e9tico. Mas podem ser perigosos tanto para os condutores como para os pe\u00f5es. Al\u00e9m disso, como \u00e9 que isto pode levantar muitas vezes a quest\u00e3o: Porque \u00e9 que os candeeiros de rua s\u00e3o roxos? Aqui est\u00e1 uma explica\u00e7\u00e3o r\u00e1pida da quest\u00e3o. Em 2007, a cidade...<\/p>","protected":false},"author":15,"featured_media":5349,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-5347","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Why Are Street Lights Purple?<\/title>\n<meta name=\"description\" content=\"How can this often raise the question: why are street lights purple? Here is a detailed explanation of the question.\" \/>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why Are Street Lights Purple?\" \/>\n<meta property=\"og:description\" content=\"How can this often raise the question: why are street lights purple? 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