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For 40% of the light transmittance range.Light transmittance project is an important indicator of the functional analysis of sunglasses.Although the European and international standards will be divided into five categories,the mirror of the sun,the bright colors of sunglasses,and a dedicated sunglasses: The current standard press of China,this sunglasses,divided into the following three categories: It is.Another category uses a different sunglasses.
Venta al por mayor barata Nike Bright colors of sunglasses for shade,the wearer good results shade,if such in the sun you will not be able to get such strong for a long time of outdoor activities,the wearer is still strong light and fatigue It will be stimulated.General decorative role or light-colored sunglasses sun is not strong indoors,.On the contrary,the strong sunlight of venue awning wearing a pupil in the room ??,that as excessive amplification discomfort,or you do not need to be blocked due to the fatigue.for cyclists and drivers to proceed faster than the speed of the pedestrian,transmission,wearing a rider,in the mirror of a small product and not suitable to the driver the sun,the effect on the ability to respond transmittance is too low given you.Average transmittance(UV spectral region)The value of the average,transmittance,UV spectral range in the lens of the ultraviolet rays on the basis of the average transmittance,is as follows.a) the UVA of 315nm? 380nm wavelength,in the average transmittance should ≤τVτSUVA.UVB of b) the wavelength of? 315nm at 290nm,the average transmittance τSUVB should ≤0.5τV.In addition,the band UVB,light-colored sunglasses,the average transmittance% ≤30 should,

Best Cheap Nike Wholesale Roshe Runaverage transmittance should be ≤5% sunshade.If the sunglasses meet this requirement,and ultraviolet which,while also blocking a substantial amount of ultraviolet radiation,either by reaching the most basic requirement of protection for blocking light to wear sunglasses,at least (to accept sunglasses Masu wear Wear corresponding amount of light amount increases) ultraviolet,when the human eye to receive UV than not wear sunglasses,which under the same external conditions,can not stop the sunglasses,which was increased in's pupil,as a result,it will reduce the flux to the human eye.In November 2006,GB10810.3 "spectacle lenses and related products - Part 3: In the formal implementation of the transmittance specification of measurement method",is well-defined ultraviolet transmittance exceed 5% It is used as becoming not lens.Sunglasses,following which generally are clearly,has a UV function:A)

Cheap Caps Wholesale New Era 59fifty is displayed as "UV400": This is a 400nm of transmittance following wavelength (λ) spectrum (λ) lens of the UV cut-off wavelength at 400nm with less than 2% τmax maximum,it means.B) "UV",labeled "UV": This is the lens of the UV cut-off wavelength from 380nm,i.e.,the maximum of the spectral transmittance (λ) is less than 2% its wavelength (λ) τmax is 380nm it means that it is less.C) and the "absorbing 100% UV" labeled: means that this is a lens has a 100% ultraviolet absorption function,an ultraviolet region,ie,the average transmittance of 0.5% or less To do.Sunglasses,to meet the above requirements,it is the true meaning of sunglasses of UV protection.an important indicator UV performance of sunglasses if we can not identify with the naked eye,sunglasses with UV protection function.Chinese performance criteria of the current product for basic requirements of UV only,the wearer can harmless.
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