LEDs do not contain any mercury, which makes them less toxic and, therefore, a safer light source to dispose of than 3 of the most ubiquitous light sources used in the world – fluorescent, metal halide, and high pressure sodium light bulbs.
Lighting can affect the level of melatonin in a person’s body, our internal circadian rhythms, our degree of alertness, our cognitive performance, the sleep patterns of Alzheimer’s patients, Seasonal Affective Disorder (SAD), our body temperature, our ability to adapt to night-shift work, and some sleep disorders.
(Source: Mariana G. Figueiro, MS, of the Lighting Research Center at The Rensselaer Polytechic Institute)
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