What are UV- A rays and UV-B rays?

can i make my table light produce uv-A rays or uv -B rays. how do i do it? are uv -A rays beneficial to produce melannin

Answers:
UVA:
Can pass through glass glass.
Is not artificial by a change contained by altitude or weather.
Is present all light of day and every day of the year.
Penetrates thoughtful into skin layers.
Is 5% of the sun's rays.
Is 20 times more numerous than UVB rays.
Affects long-term skin damage.

UVB:
Cannot intervene through window cup.
Causes sunburn.
Causes tanning.
Helps the body with average vitamin D production.
Varies with the season. It is more intense surrounded by the summer than in the winter.
Varies next to weather conditions.
Is more intense at midday than in the morning or tardy afternoon.
Is more intense at high altitudes and practical the equator.
Is 0.5% of the sun's rays.
Is protected against by the sun protection factor (SPF) in sunscreens.
Is related to more than 90% of nonmelanoma skin cancer.
Is related to cataract.

More:

How Sunlight Works

Sunlight arrives on earth contained by three forms: infrared (heat), visible pale and ultraviolet. Ultraviolet light is classified into three category:
UVA (315 to 400 nm), also known as black insubstantial, which causes tanning
UVB (280 to 315 nm), which cause damage surrounded by the form of sunburn
UVC (100 to 280 nm), which is filtered out by the atmosphere and never reach us.
99% of the sun's UV radiation at sea plane is UVA. It is the UVB that causes most of the problems related to sun exposure: things approaching aging, wrinkles, cancer and so on, although research is increasingly implicating UVA as okay.
One of the interesting things about UV radiation is that it is reflect by different surfaces. These reflections can amplify the effects of UV exposure. For example, snow reflect 90% of UV light. That is why you can acquire snow blindness and severe sunburns from skiing on a sunny day. Sand can echo up to 20% of UVB that hits it, meaning that you can grasp extra UV exposure at the beach.

On the other paw, certain things occupy almost all UV radiation in part or completely. Glass is one of these substances - many eyeglasses are very worthy absorbers of UV (which is why you may have hear that you cannot get sunburn contained by a greenhouse - just receive sure it is glass and not plastic covering the greenhouse!). Most sunscreens use chemicals that own the same UV-absorbing properties.

Ultraviolet (UV) wispy is electromagnetic radiation with a wavelength shorter than that of apparent light, but longer than soft X-rays. It can be subdivided into effective UV (380–200 nm wavelength), far or vacuum UV (200–10 nm; abbrev. FUV or VUV), and extreme UV (1–31 nm; abbrev. EUV or XUV).

When considering the effect of UV radiation on human health and the environment, the collection of UV wavelengths is often subdivided into UVA (380–315 nm), also call Long Wave or "blacklight"; UVB (315–280 nm), also called Medium Wave; and UVC (< 280 nm), also call Short Wave or "germicidal".

no they are bad 4 ur skin it cause skin cancer, they r rays from the sun

When considering the effect of UV radiation on human health and the environment, the compass of UV wavelengths is often subdivided into UVA (380–315 nm), also call Long Wave or "blacklight"; UVB (315–280 nm), also called Medium Wave; and UVC (< 280 nm), also call Short Wave or "germicidal". See 1 E-7 m for a list of objects of comparable sizes.

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What are UV- A rays and UV-B rays?

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