Street lighting impact on the environment, animal life
Studies in Europe have demonstrated that street lighting has a significant effect on the mood of human beings, animal life and the environment. It affects navigation of birds and insects, mating behavior in animals and flowering in plants. Millions of insects are attracted to street lights at night (particularly during summer months) and perish. These insects can be an urban nuisance besides adding to the cost of cleaning up lamp fixtures and the street sidewalk to remove dead insects. But not all street lights attract insects or affect animal life the same. The impact of LED lights on animals is much smaller compared to other lights.
Light pollution and glare in street lighting
IESNA classifies luminaires as »non cutoff«, »semi-cutoff«, »cutoff« and »full cutoff«, depending on how much of light is dispersed above the horizontal line of luminaire.
The non-cutoff fixtures usually include the globe-shaped lamps that are mounted on top of lampposts. These lamps distribute their light in all directions. A major problem is created by the light pollution and glare, as they shoot their light upwards into trees and towards the sky rather than down towards the ground. Non-cutoff fixtures are rarely found on roadways because they tend to blind the driver.