The colossal energy of the sun made it possible for life to exist on earth. This energy reaches us in the form of radiation (waves). The shorter the waves, the greater their intensity. The strongest beams are filtered by the ozone layer; however this layer is no longer as effective as it was in the past and more radiation now reaches the earth causing a major threat to animals, plants and people.

At 2000m the radiation is 25% stronger than normal - as it is at the equator. Although UV radiation is not visible, it is a great deal more powerful than light. We must protect our skin from these rays!

In the summer the UV rays are more intensive because the path through the atmosphere is shorter. The difference between winter and summer is approx 33%. In summer therefore we need higher protection.

The sun's strength changes according to the time of day.

Around midday, the angle of incidence is greatest and the distance therefore to the ground is shortest, making sunburn much more likely. In hot countries, animals and people retreat to the shade and sleep at this time of day - very good sense!

Another important factor is the reflection of the sun's rays which greatly increases the power of the radiation by the following percentages:

Cool winds on or from the water can disguise the power of the sun so extra care is needed.