- Sodium lamps emit light omnidirectionally, while LEDs are directional. - LEDs have a significantly longer lifespan than sodium lamps. - Sodium lamps provide poor color rendering (monochromatic light), while LEDs offer much better color rendering.
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 using the code given below.
Asked in UPSC IAS 2021 · Topic: Optics (Laser: Principles and applications)
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