TABLE 1.

Optical radiation and its degree of penetration. ² , ¹¹

Percentage of sunlight	Radiation		Wavelength	Penetration
45%	Infrared	IR‐C	3000 nm–1 mm	To subcutis of skin
		IR‐B	1400–3000 nm
		IR‐A	700–1400 nm
50%	Visible	Red	625–700 nm	To dermis of skin
		Orange	590–625 nm
		Yellow	565–590 nm
		Green	500–565 nm
		Blue	485–500 nm
		Indigo	450–485 nm
		Violet	380–450 nm
5%	Ultraviolet	UVA	400–315 nm	To dermis of skin
		UVB	315–280 nm	To epidermis of skin
		UVC	280–100 nm	To stratosphere