A photo taken by Scott Kelly, an American astronaut from International Space Station (ISS) shows the effect of Canadian city Calgary’s LED streetlights conversion.
LED Lit Canadian City Looks Fairer Now from Space
Calgary, a city located in Alberta, Canada. Last week, Astronaut Scott Kelly posted an aerial photo to Twitter with the caption "#GoodMorning #Calgary and all my friends in #Canada!"
Calgary started to replace the existing high-pressure sodium (HPS) street lights with new, energy efficient fixtures in September. The transition is expected to be completed by 2018, targeting 80,000 city-wide streetlights.
Compared to HPS lamps, LED streetlights have cooler hue and produce directional beam. Less upward light potentially means reduced light pollution. Moreover, LED streetlights provide better quality street lighting so that making objects appear clearer and more defined. In order to better observe the night sky, the local group Rothney Astrophysical Observatory played a crucial role in the conversion of LED streetlights.
So far, the city installs an average 2,000 LED streetlights per month. Meanwhile, the city welcome residents to reply any situation where the streetlight beam is too strong and had influence their activities at night.