The Problems that arise and how to avoid them All lights are characterized by different wavelengths (spectrum), which you can see on the map here, such as the electromagnetic spectrum. The visible light for humans occurs between about 400 nanometers (nm) and 780nm. Anything above that is infrared (which only some animals, such as cats, for example, can be see). Ultraviolet light appears in the spectrum of about 100 nm. to 400 nm., and are further divided into groups A, B and C. A basic knowledge to understand is that the LED lights are actually UV lights because they emit light that is in the UV range (especially UV-A). Gel Polishes are using photo initiators that, once exposed to correct wavelength of light, will absorb energy and will activate
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