The light is not exploited, which often exceeds 25% and in some cases exceed 50% (balloon-type lamps), we also have to pay. It forces us to use higher wattage lamps because we are only using part of it, lost the rest unnecessarily. This excess of consumption that should supply the power plants, leads to an increased fuel consumption and, consequently, increased emission of pollutants into the atmosphere, among other things responsible for the greenhouse effect that is driving up the average temperature of our planet and acid rain that destroys forests.

Glare:

Light falling directly from the lamp in our eyes have an intensity far above that which reaches us reflected by the ground and the obstacles it presented, making them look worse since the opening of the pupils is closed until further adapted to this light intensity.

This annoying glare produces eyestrain us, reduces our perception and, consequently, increases the risk of traffic accidents, ie, reduce road safety.

It also adversely affects the nightlife of wildlife, especially some birds (a notorious case is that of the offspring of shearwater in its first flight become disoriented and crash due to the glare of the people, hurting and dying in many occasions).

Intrusion into the privacy of persons:

By illuminating facades and windows with no light at the ground there are very annoying and facilitates the indiscretion of the pedestrians.

Difficult and obscure vision reaches of the starry sky: This is a really unfortunate result for all and especially for the astronomer, as this wonderful show, inexhaustible source of knowledge and beauty, which undoubtedly is the vision the rest of the Universe which we belong, has deteriorated so because of the pollution, that until we have lost the habit of looking at the sky at night, then left to call attention.

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