Basics
Knowledge Base articles tagged Basics.
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What is UVA radiation?
UVA is the long-wavelength band of ultraviolet light (315–400 nm). Learn where it sits in the UV spectrum, why ~95% of the UV reaching the ground is UVA, and how it behaves through the day, through clouds and through glass.
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UVA vs UVB: what's the difference?
UVA vs UVB compared: wavelength, how deep each penetrates skin, sunburn vs photoaging, vitamin D, skin-cancer roles, and how clouds, glass, time of day and season affect each.
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Does glass block UVA? Windows, cars and UV film
Ordinary window glass stops almost all UVB but lets a large share of UVA through. How much passes through home, office and car glass, why windshields differ from side windows, what the driver skin-cancer studies show, and how to choose UV film.
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UVA on cloudy days: how much gets through
Cloud dims UVA far less than it dims sunlight — and broken cloud can briefly push UVA above clear-sky levels. Transmission by cloud type, why UVA penetrates cloud better than UVB, the cloud enhancement effect, and how the UVA Index models it.
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