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Windshield Sun Shades. Typically, the glass of the car's windshield itself blocks most of the UV light from the sun, and some of the infrared radiation.But it can't protect from the visible light that mostly penetrates through the window and gets absorbed by the objects inside the car.
Some current visors can also be extended along the side window to block sunlight all of the way to the "B" pillar to block the light for the driver or passenger. The sun visor's flap or core is typically made from pressboard with a piece of metal for its attachment onto a mounting bracket. [5] Some are made of molded substrates or polypropylene.
A space sunshade or sunshield is something that diverts or otherwise reduces some of the Sun's radiation, preventing it from hitting the Earth and thereby reducing its insolation, which results in reduced heating. Light can be diverted by different methods.
Protection from UV light can be accomplished by a film that addresses only the UV spectrum. As UV is one of the main sources of fading, [6] it can prolong the life of fixtures and fittings. Basic colorless clear films reject (absorb) some UV radiation up to 380 nm, and depending on the manufacturer, UV inhibitors are added to the polyester ...
Sunburn effect (as measured by the UV index) is the product of the sunlight power spectrum (radiation intensity) and the erythemal action spectrum (skin sensitivity) across the range of UV wavelengths. [9] [10] The UV index is a number linearly related to the intensity of sunburn-producing UV radiation at a given point on the Earth's surface.
Variable tint or photochromic lenses increase their optical density when exposed to UV light, reverting to their clear state when the UV brightness decreases. Car windscreens filter out UV light, [53] [54] slowing and limiting the reaction of the lenses and making them unsuitable for driving as they could become too dark or too light for the ...