Do we use light properly ?
![Empty lighted parking lot at night.](https://cdn.prod.website-files.com/603cdab8649a71a079204401/60e2e88684d0ec4677aa5727__DSC4150.jpg)
... it is estimated that worldwide energy consumption for lighting generates 1900 Mt of CO2 per year, and annual lighting costs are over $360 billion ... [→]
![Red lighting penetrates into living area.](https://cdn.prod.website-files.com/603cdab8649a71a079204401/60e2e89f9a9efa883ff17685__DSC7551.jpg)
... global increases of 2.2 % per year for lit areas and 2.2 % per year for the brightness of continuously lit areas ... [→]
... 30 % of the electricity generated for outdoor illumination is simply squandered by being misdirected into the sky ... [→]
![Red lighting penetrates into living area.](https://cdn.prod.website-files.com/603cdab8649a71a079204401/60e2e86a122bee7e35554cda_DSC05792.jpeg)
![Empty lighted parking lot at night.](https://cdn.prod.website-files.com/603cdab8649a71a079204401/60e2e88aa58ab55f0bea393c__DSC8373.jpeg)
... 80% + of the world and 99% + of the U.S. and European populations live under light-polluted skies ... [→]
... nocturnal light has been associated with health problems in humans as a consequence of altered biological rhythms ... [→]
![](https://cdn.prod.website-files.com/603cdab8649a71a079204401/60e2e86609a643aeba644af7__DSC3596.jpg)
![](https://cdn.prod.website-files.com/603cdab8649a71a079204401/60e2e8b19268572c8ca05741_IMG_2307_rt.jpeg)
... light pollution of the night sky is not confined to developed countries, but rather appears to be a global-scale problem affecting nearly every country of the world ... [→]
... variation in the spectral composition of artificial nighttime lighting doubtless influences the nature and extent of the impacts on ecosystems ... [→]
![](https://cdn.prod.website-files.com/603cdab8649a71a079204401/60e2e85209a64357ff6447f4__DSC2894.jpg)
... continuous artificial lighting disturbs the growth cycles and the recognition of the seasonal change ... [→]
... white LEDs are more attractive to insects and have greater ecological impacts than high-pressure sodium vapor lamps ... [→]
![](https://cdn.prod.website-files.com/603cdab8649a71a079204401/60e2e88c211bf9e1ac5a497f_20210524-_21_0041.jpg)
... the empirical evidence that street lighting improves road safety, and under what circumstances, remains limited ... [→]
![](https://cdn.prod.website-files.com/603cdab8649a71a079204401/60e2e8630cde5e239e5d01ea__DSC3582.jpg)
... the increase in brightness can increase glare for older drivers from oncoming vehicles ... [→]
... inside of the city overcast nights are brighter than clear rural moonlit nights, by a factor of 4.1 ... [→]
![](https://cdn.prod.website-files.com/603cdab8649a71a079204401/60e3147d6a3f63e0141cde22__DSC7344.jpg)
![Empty lighted parking lot at night.](https://cdn.prod.website-files.com/603cdab8649a71a079204401/60e2e85cfa139e73651afb88__DSC3362.jpg)
... many nocturnally migrating birds die or lose a large amount of their energy reserves during migration as a result of encountering artificial light sources ... [→]
... nocturnally migrating birds were disoriented and attracted by red and white light ... [→]
... due to artificial lighting stars are no longer visible in many urban areas ... [→]
![](https://cdn.prod.website-files.com/603cdab8649a71a079204401/60e2e85219f053e964b69bc5__DSC3615.jpg)
![](https://cdn.prod.website-files.com/603cdab8649a71a079204401/60e2e85de6585aa16999b19e__DSC4236.jpg)
... sources emitting primarily blue light are a cause of concern for exposure to children’s eyes ... [→]
... caution is suggested for circumstances occurring over many days with continuous exposure to optical radiation ... [→]