DS-UV308P3Z-3535AC-S-02

0.2W Uv led 308nm smd 3535 uvb led phototherapy

UVB wavelengths

Wavelength 290~320nm, also known as the red spot effect of ultraviolet medium wave.Medium penetration. Shorter wavelengths of sunlight are absorbed by clear glass. Most of the UVB contained in sunlight is absorbed by the ozone layer, and less than 2% reaches the Earth's surface.UVB ultraviolet light has the effect of erythema on the human body, can promote the mineral metabolism and the formation of vitamin D in the body, but long-term or excessive irradiation will make the skin tan, and cause redness and peeling.Ultraviolet health lamp, plant growth lamp is emitted by the use of special transparent purple glass (not through the light below 254nm) and the peak near 300nm phosphor made.

UVB is a wave band that divides ultraviolet wavelengths according to biological effects. UVB is outdoor ultraviolet radiation, which is directly injected into the skin when people are outdoors.UVA and UVB rays, which are not absorbed by the ozone layer, reach the earth's surface and cause damage to our skin.UVB damage and protection has been thoroughly studied, it can make the skin in a short time of sunburn, red (for the average person is about 25 minutes), SPF is the UVB protection ability sign.

So-called SPF value is to point to the product's ability to protect against UVB rays, namely the ability to prevent the skin from being sunburnt.Say generally, the time that the person's skin produces erythema below direct sunlight is 20-25 minutes, if the SPF value of a bottle of bask in milk is 8, apply with it, the protection time to the skin is 20(25)×8=160(200) minutes or so.For details, please refer to the following table:

SPF value usage conditions

2-8 Winter sunshine, spring and autumn morning and evening sunshine and cloudy and rainy days

9-20 Summer morning and evening and moderate intensity sunshine

21-30 Outdoor work, travel, strong sunshine in summer

More than 30 specific environment (such as plateau), strong sunlight exposure

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