First we need to understand a word: transmittance. Transmittance, also known as transmission coefficient, refers to the ratio of the luminous flux through the lens to the incident luminous flux. Simply speaking, it is the transmittance or transmittance of visible light. For example, if a sunglasses lens has a transmittance of 40%, that is, only 40% of visible light can pass through the lens into the eye.
According to the transmittance of visible light, the lens can be divided into 1-4 categories from shallow to deep:
One type: light-colored sunglasses; projection ratio 43%~80%
The lightest color, shade and reduce the minimum luminous flux, generally used as a fashion accessory mirror
The second category: light shade mirror; transmittance 18%~43%
Lighter in color, used on cloudy or cloudy days;
Three categories: sun visor; transmittance 8% to 18%.
Most sunglasses belong to this level, suitable for outdoor activities such as seaside and mountain climbing;
Four categories: special purpose sunglasses; transmittance 3%~8%
It is used in skiing, desert, electric welding and other environments.
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Model#: |
WP1045 |
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Item Type: |
Promotion Sunglasses, logo sunglasses square |
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Frame Material: |
PC |
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Lens Material: |
PC |
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Age |
Adult |
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ODM/OEM service: |
Yes |
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MOQ: |
300pcs |
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Certificate: |
FDA, CE |
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