Datasheet

Designing the VEML6070 UV Light Sensor
Into Applications
Application Note
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Vishay Semiconductors
APPLICATION NOTE
Revision: 26-Mar-18
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Document Number: 84310
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What does this wavelength mean? To understand this, the diagram below shows that it is in the middle of the so-called
UVA region.
Fig. 4 - Light Spectrum
Visible light has wavelengths between 400 nm and 750 nm.
UV light has shorter wavelengths, from 200 nm to 400 nm.
UV type A has light with wavelengths between 320 nm and 400 nm.
UV type B has wavelengths between 280 and 320 nm.
UV type C is between 200 nm and 280 nm.
While UVA and UVB reach earth, UVC is blocked by our atmosphere, so it does not cause harm.
Fig. 5 - Radiation that Reaches the Earth’s Surface
Visible InfraredUltraviolet
Wavelength (nm)
100 280 320 400
700
UVAUVBUVC
Cosmic-
Rays
0.1 % 4.9 %
39 %
56 %
Ozone Layer
Infrared
VisibleUVB UVAUVC
X-
Rays
Gamma-
Rays
Microwave