It’s not uncommon to see sunscreen terminology on sunscreen products, but as cosmetic geeks we have a harder time dealing with it than solving GCSE math.The next step is to take you through what these terms really mean. UVA: UVA band, wavelength 320-420nm, also known as long-wave dark spot effect ultraviolet light . It has a strong penetrating power and can penetrate most transparent glass as well as plastic. More than 98% of the long-wave UVB contained in sunlight penetrates the ozone layer and clouds to reach the earth’s surface, and UVA can reach the dermis of the skin, destroying elastic and collagen fibers and tanning our skin. UVA at 360nm matches the phototropic response curve of insects and can be used to make insect trap lights. UVA UV at 300-420nm can pass through the special colored glass lamp that completely cuts off visible light, and only radiates near-UV light centered at 365nm, which can be used for ore identification, stage decoration, and money inspection. UVB: wavelength 275~320nm, also known as medium-wave red spot effect ultraviolet .
Moderate penetration, the shorter part of its wavelength is absorbed by transparent glass, and most of the medium-wave UVB contained in daylight is absorbed by the ozone layer, with less than 2% reaching the earth’s surface, which can be particularly strong in summer and late afternoon.UVB UVB has an erythematic effect on humans and promotes mineral metabolism and vitamin D formation in the body, but prolonged or excessive exposure can cause skin tanning and redness and peeling.
UVB health lamps and plant growth lamps emit are made using special translucent violet glass (which does not transmit light below 254nm) and phosphors that peak around 300nm.
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