UPSC PRELIMS · GEOGRAPHY · SODIUM LAMPS AND LEDS
With reference to street-lighting, how do sodium lamps differ from LED lamps? 1. Sodium lamps produce light in 360 degrees but it is not so in the case of LED lamps. 2. As street-lights, sodium lamps have longer life span than LED lamps. 3. The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street-lighting. Select the correct answer.
Take a breath. Choose one. Press A–D on your keyboard if you like.
EXPLANATION
Sodium lamps are close to monochromatic, while LEDs provide broader colour options; sodium lamps do not have the claimed longer life.
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