LED street lighting is more luminous, exhibits a bluer hue, and heightens environmental risks.
An investigation of pictures from the International Space Station revealed that transitioning outdoor lighting from warm high-pressure sodium to cooler LED lights led to elevated light levels and a spectral shift towards bluer light. A study by the University of Exeter, published in Science Advances, reveals that "this trend is significantly elevating the risk of detrimental impacts on ecosystems."
Prior research examined the impact of LED streetlights on bats and insects, while earlier evaluations of satellite imagery indicated expansions in illuminated areas and brightness levels.
The University of Exeter study analyzed photographs of Europe from 2013, when high-pressure sodium and mercury vapor fixtures were prevalent, and compared them to images from 2020, when numerous countries had transitioned to more efficient LED lighting.
LED street lights are "phosphorescent," use blue LEDs to excite a yellow phosphor, with the color temperature resulting from a combination of blue and yellow light. Sunlight is an optimal source of illumination, and human vision has adapted to function most effectively under it. Consequently, it was logical for individuals to believe that this was optimal for streetlights, which were engineered to prioritize optical clarity and the ability to read license plates. Phosphor mixtures can be modified to produce various hues; however, cooler, bluer lights are more economical and efficient.
The current study also validates a contentious issue discussed on Treehugger: the involvement of English economist William Stanley Jevons.
"Although the LED lighting revolution was advocated to diminish energy consumption, emissions
-and likely energy consumption-have escalated at national or regional levels." A plausible explanation for this is that the transition to LED street lighting coincided with the implementation of a European standard that resulted in enhanced illumination. An alternative explanation is the presence of a 'rebound effect' or 'Jevon's paradox' in outdoor illumination, wherein enhancements in energy efficiency and the resultant perceived reduction in economic expenditure have stimulated heightened demand for lighting, thereby negating any efficiency improvements through augmented light consumption.
The research examined the influence of blue shift and heightened luminosity on melatonin suppression, star vision, and insect behavior.
Melatonin cycles are fundamental regulators of our circadian rhythm. The American Medical Association stated, "Blue-rich LED streetlights emit wavelengths that significantly inhibit melatonin production at night." White LED lamps are expected to influence circadian sleep patterns five times more than traditional street lamps. The study indicates that melatonin suppression levels have risen across Europe between the two eras.
Cree Unveils Warm LED Street Lights
The study observed that, similar to other animals, humans have historically utilized starlight for navigation. However, in contemporary societies, a more pressing issue is the potential consequences of diminished visibility of the natural night sky on individuals' perception of 'nature' and their position in the cosmos, as well as on astronomical research. The researchers observed a notable deterioration in stellar sight, however Elon Musk may also be partially responsible for this decline.
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