Скачать или смотреть Why Street Lights are Yellow In Color? स्ट्रीट लाइट पीली क्यों होती है? | The Smarter Things

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Streetlights and industrial lights, such as those found in parking garages or manufacturing facilities, give off a yellowish or orange glow, Why?
Because These are “high-pressure sodium" lights or sodium vapor gas-discharge lights.
The reason they are orange is that the lamps are filled with sodium gas.
These sodium vapor lights were invented in the mid-20th century with commercial production starting in the 1930s and become more common in the late 1980s because of their efficiency in lighting large areas. Since sodium lights produce light in a range on the electromagnetic spectrum that is extremely sensitive to the human eye, there is less power required to light large areas like streets, parking garages, and parking lots. Energy efficiency is the reason they have been so widely used.
They are common because they were the most economical and efficient. They are used in places where accurate color isn't important. You never see these lights in stores. When you shoot an electric current through the sodium it emits yellow light. It’s very efficient, that is, it gives more intensity per electric power than any of the other lamps that people used to use.
Of course, they are now being replaced by LED lights, which are bright white and more efficient.
Today, however, LED (light-emitting diode) lights are being used more commonly as they are even more energy-efficient, cost-effective, and have a much longer lifespan. The trade-off though is that the light output of an LED is much brighter and bluer in color, which can disturb people’s sleep when used in streetlights. LED lights give off white color emissions because they produce light on the white and blue portions of the electromagnetic spectrum around 5,000K. They aren’t as bright, but you can put a lot more of them out there and get the same intensity. So slowly everything’s being replaced by LEDs.



Credits
Director: Anish Yadav & Aishwarya Kaushik
Editor: Anish Yadav
Cinematographer: Anish Yadav, Aishwarya Kaushik, & Deepanshu.
Script writers: Anish Yadav & Adnan Parvez
Content & screenplay writer: Adnan Parvez



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