UV spectrum
Knowledge Base articles tagged UV spectrum.
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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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Why UVA changes far less with the seasons than UVB
Ozone absorbs UVB strongly and UVA barely at all, so a low winter sun collapses UVB while UVA falls only modestly. Why winter and early-morning UV is disproportionately UVA, with the numbers — and why a low UV Index never means low UVA.
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