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.

Question

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. ​

CollectorBabu · Accepted Answer

Correct Answer: 1 and 3 only ​. Statement 1:  Sodium vapor lights are omnidirectional and produce light in 360 degrees while it is not the case with LED lamps. So statement 1 is correct. Statement 2: LED lifespan can be greater than 100,000 hours (more than four times that of Low pressure Sodium or High Pressure Sodium). Hence, statement 2 is wrong.   Statement 3:  The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street-lighting. Hence, Statement 3 is correct.

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