The Sun is the source of life and a synonym for vacation and rest. Besides pleasant, the sun is seen as a way to get a tan and look more healthy.

Although Sun has positive effects on our health, excessive and inappropriate exposure to the sun can have serious long-term consequences.

Solar Radiation

The sun emits different types of solar radiation. They are classified by their properties and their wavelength, which determines the ability to reach the Earth's surface.

The sunbeams are classified into visible (light), infrared (heat energy) and ultraviolet. These are the effect of causing the pigmentation of the skin.

Types of UV

The ultraviolet radiation is classified into:

·  UVA: are arriving in greater numbers to the earth's surface. In excess are harmful to health.

·  UVB: they are more harmful than the previous ones. Mostly they are absorbed by the ozone layer, but the deterioration of the same is increasingly allowing their passage.

·  UVC: these are the most harmful and do not reach the earth's surface.

The incidence of the rays of the sun on Earth, and hence its harmful effects also depend on factors such as altitude, latitude, time of day and the area in which they reflect the sun.

Beneficial Effects of the Sun

The solar radiation that reaches the Earth and penetrate the skin have positive and negative effects. Beneficial effects of the Sun on health can include:

·  It contributes to the formation of vitamin D.

·  Aid for the disappearance of some dermatitis or skin diseases.

·  It promotes better blood circulation.

·  Improvement some diseases such as rheumatic.

Negative effects of the Sun

If sunlight is excessive and inappropriate effects of the sun can be detrimental to health and have consequences such as:

·  Emergence of spots on the skin.

·  Burns and irritations.

·  Danger onset of melanoma (skin cancer).

·  Aceleramiento of aging.

Exhibition solar appropriate

To avoid the harmful effects of the Sun and care must be taken several precautions:

·  Avoid sun exposure between 12 hours and 16 hours.

·  Not too prolonged exposure depending on the skin type of each.

·  Protecting yourself with appropriate clothing.

·  Using hat and sunglasses.

Solar Protectors

They are cosmetic products whose function is to prevent the ultraviolet rays from penetrating our skin. They are always needed, but whether there will be prolonged exposure to the sun.

The protection of these products is never total and the European Union has recently adopted rules for the labeling of sunscreens which will come into force next year in order not to confuse the consumer:

·  Classifying disappear as a product of total protection.

·  The Sun Protection Factors (SPF or SPF) will be reduced to eight: 6, 10, 15, 20, 25, 30, 50 and +50.

·  Beside the issue of Protection Factor should appear legend protective high, medium, low and very low.

·  They should explain to what type of sunlight offer protection because traditionally served only for UVB and not for UVA, which has also been shown to be harmful.

Sun Protection Factor

All sunscreens are characterized by having a Sun Protection Factor (SPF or SPF), which indicates the time that a person can be exposed to the sun without risk of burns.

This is calculated by multiplying the amount of time a person can exposed to the sun without protection and without burn by the number of FPS. So if a person can normally be 20 minutes at the Sun and applying a sunscreen factor of 20, may exposed to the sun 400 minutes.

Types of skin

The FPS or SPF needed for each person depends on your photo, which is the ability of the skin to receive solar radiation. The phototypes of classified into:

·  Phototype 1: people very white skin and clear eyes. It burned at very short exposure to the sun and barely broncean. They require very high protection.

·  Phototype 2: fair-skinned people and clear eyes. It burned easily and broncean slightly. They need protection high.

·  Phototype 3: skinned people and chestnut brown eyes. It was burning less readily and broncean. They need protection media.

·  Phototype 4: people with white skin and dark hair and eyes. They do not usually burn and broncean. They need protection media.

·  Phototype 5: people with very dark skin and eyes and dark hair. They do not usually burn and broncean very easily. They need a low protection.

·  Phototype 6: people with black skin. There are burned. They require protection very low.