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    選兒童護眼燈小心被廣告忽悠,亮度值并非越高越好
    更新時間:2018-11-22   瀏覽:

    課業負擔重,以及過量使用電子產品,“小眼鏡”越來越多了。家長們在盡量控制孩子們接觸電子產品之外,對他們學習時用的臺燈也挑剔起來,護眼臺燈開始受寵。

      在燈具市場,針對護眼燈,商家紛紛打出了“無頻閃”“預防近視”“保護眼睛”等促銷招牌,其款式多樣價格也參差不齊,往往讓想選購的家長感到眼花繚亂,無從下手。給孩子學習用的臺燈到底該怎么挑?護眼燈到底護不護眼?

      照度分A級和AA級兩個等級

      家長們在挑選護眼燈時關心亮度、色溫以及藍光等指標是什么意思?在有陽光的時候室外的照明強度能到十萬勒克斯以上,在室內的話可能也就幾百個勒克斯。勒克斯是光照強度的單位。根據現行的《中小學校教室采光和照明衛生標準》,教室里課桌面上的平均照度值,應不低于300勒克斯。

      照度,簡單地說就是光夠不夠亮。照度值越大,讀寫工作時的視覺感受越好,工作效率越高。而照度均勻度,反映了燈光分布的明暗情況。人的瞳孔會因為光的不同而收縮,如果光照不均勻就會不斷收縮瞳孔,人的眼睛就會容易疲勞。照度均勻度數值越小,說明燈所發出來的光明暗變化越小,人眼更舒適。照度在今年4月1日實施的《GB-T9473》(讀寫作業臺燈的性能標準)要求里面,分了A級和AA級兩個等級。達到300勒克斯是A級的,這是最低線,AA級會更高,是500勒克斯,AA級產品會比A級產品更好。

      藍光危害分為四個等級

      視網膜里面,感光細胞就有感藍光的。過強的藍光,或者過強的紫外線,對人眼不好。藍光是白光的組成部分,不可能被完全去除掉,只有過強的藍光和長時間藍光照射,會影響眼睛安全,而傷眼藍光的主要來源是電視、電腦等顯示屏。

      國際照明學會經過大量的基礎性研究將照明產品對人眼的藍光危害分為4個等級:無危險類(RG0類)、低危險類(RG1類)、中等危險類(RG2類)和高危險類(RG3類)。家長們關心的藍光是用光譜儀采光,并通過數據分析得來的。藍光低于100就代表著它屬于危險等級零級,就是無危險,一般臺燈都要求是RG0,也就是說不能超過100。所謂RG0叫無危害。目前為止,在標準里,允許范圍內,RG0、RG1都屬于合格品。

      亮度值不是越高越好

      從色溫角度來說,不同顏色的燈對于孩子近視進展沒有特別明顯影響。近視的主要危險因素是高強度、近距離工作,如果減少看書時間,多做戶外運動的話會更好。燈的色溫值也就是燈的顏色,只要在使用時,讓人感覺舒服就可以了,并不對護眼有太大影響。

      在我們看來,亮度就是刺不刺眼,或者說亮還是不亮,其實這是我們的主觀感覺,《GB-T9473》標準里面給出了一個限值,建議亮度是不能高于2000坎德拉每平方米。檢測亮度需要經過專門校準處理的成像亮度計,它可以在標準設計情景下連續拍攝照片,每張照片的亮度數據,會導入電腦進行分析,就能知道我們在使用這盞臺燈時的亮度情況了。

      亮度并不是值越高越好,或越低越好,實際選擇時還是要以主觀感受為準,看光是否刺眼。而300毫米和300-500毫米范圍的照度、均勻度,則是一套配套指標,用來檢測臺燈的照明性能。比如,如何判斷有沒有頻閃,需要用示波器,加光度探頭來測頻閃,如果看到顯示的是條平的線,就說明它沒有頻閃,一般LED的產品,它頻閃都不是很明顯,除非它的電源做得不好。

      如何才能避免眩光

      眩光,指燈光刺不刺眼,是評價臺燈性能的一項重要指標,作為光源本身,亮度越高,眩光越明顯;光源位置距離視線越近,眩光越明顯。

      如何才能避免眩光?孩子坐在正常讀寫位置朝燈看去,應看不到發射器內壁及光源;其次可以考慮采用帶有遮光附件的燈具,如設置透鏡、格柵等防眩光的措施,增大燈具截光角,減少眩光;一定不要直接采用裸露在外的燈泡,避免光線的直射。另外,在選擇桌面材質時也應注意,盡量不要選擇有光澤的桌面,會反射燈具、天花板和墻的亮度,產生反射眩光。

      消費者如何挑選臺燈

      色溫并不算特別重要的性能指標,因此消費者可以根據自己的習慣,選擇偏黃色或是偏白色的燈。顯色指數是用來衡量顯色性的重要指標,就是燈下的色彩是否更接近自然光下的色彩。而這個值越接近100越好,值越大表示對物體顏色的還原性越好,說明在這個燈光下看到的顏色,與自然光線下的色差越小。

      從專業角度來講,其實沒有護眼燈,也沒有哪個燈具有護眼的特殊功效。所謂的“護眼燈”,真實名稱是讀寫作業臺燈,屬于民用燈具中一種普遍使用的照明產品。選燈先看包裝,3C圖案不能少,如果還有寫引用標準,藍光危害等級,以及產品關于顯色指數、照度、均勻度等數值,那產品就比較值得信任了。另外,如果有標注國家AA級字樣,那產品就更有保障了。

      在不少家長看來,燈光太暗會影響孩子的視力,于是在選購臺燈時,往往會片面追求燈光的亮度,覺得燈光越亮肯定對孩子的視力就越好。其實這樣的想法是不正確的,因為光照過亮也是視覺的疲勞源之一,長期使用將影響孩子視力的正常發育。在選購臺燈時除了不能選擇光照過亮的臺燈外,也最好不要選擇純白色燈光的臺燈,純白色的臺燈同樣有著光線過于明亮的問題,刺激孩子的眼睛,影響視力。臺燈的光源最好呈淡黃色光線,藍白色光對人眼有一定的損害,在選購臺燈時最好也不要購買。

      買燈時,還可以試試直視光源。如果在直視的時候,發現它的輸出亮度讓眼睛舒適度要好一些,就可以考慮購買。選燈時,其實不用過于關心瓦數,而是在直視光源時,看看是否感覺刺眼,如果刺眼就要慎重選擇了。此外,藍光溢出問題也是有一些選擇方法的。如果是裸的燈珠,藍光危害可能性很大,如果是做了一些光學處理的,這個藍光危害,基本上都是能進行控制的,所以建議大家還是買上面有一些看不見燈珠的,或者說,燈珠不是直接暴露在外面的這些臺燈。

      還有些消費者忽略了一點,燈罩是否罩得住燈體,這個其實是很重要的因素,如果燈罩不能罩住燈體,那么眼睛就會受到強光直射,影響使用者的視力。

      臺燈的高度也是不可忽略的要素。通常,眼睛距離書本30厘米時,既能看清字跡,也不會過度疲勞,以此推算,臺燈的高度距離書面40—50厘米比較合適,這樣既保證充足的閱讀照明,周圍的環境也有一定的亮度。臺燈太低,光線照射的范圍小,周圍則一片漆黑。失去了可供遠望的參照物,會使眼部各調節系統都處于只看近處的緊張壓縮狀態,眼睛很快就會覺得疲勞,并迅速積累,造成“光源性近視”。臺燈過高,即使有合格的燈罩也沒有用,光線同樣會直接照到我們的眼睛,產生眩光,而且近距離強光還會在視網膜上造成光滯留現象,長時間的眼肌緊縮,對孩子們的視力更加不好。


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