More bright lights are needed to illuminate the streets of Mo Ta city at night. Mostly yellow light diffused sodium light is used for this. The science behind the choice of yellow light instead of the attractive white light of mercury, tubelight and halogen.
When white light passes through some medium, colorful circles appear in seven colors. This process is more common when there are rain showers in the atmosphere and obstruct traffic. The yellow light of sodium light spreads evenly and does not refract. The capacity of sodium light is even higher. One watt of sodium light gives more light than one watt tube. The same goes for keeping the headlights of cars and other vehicles yellow.
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