Key points from article :
Cost efficient new light-emitting diodes (LEDs) can have bad effects on health.
New LED bulbs used in streetlamps emit a very bright light.
This can disrupt the circadian rythm in human body and impact on sleep quality and daytime alertness.
Can affect wellbeing, safety and could lead to glare and a rise in light pollution.
High levels of blue light are known to cause damage to the retina in the eye.
Could avoid this by using LED lights which emit warm-coloured light, particularly in densely populated areas.
