Science & Technology2021
With reference to street - lighting, how do sodium lamps differ from LED lamps?
- Sodium lamps produce light in 360 degrees but it is not
- As street -lights, sodium lamps have a longer lifespan
- 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.
Explanation
The correct answer is 1 and 3 only. Sodium lamps emit light in a broad 360-degree angle, which can lead to light pollution and less efficient illumination of targeted areas compared to directional LED lamps. Additionally, sodium lamps produce a nearly monochromatic yellow light, which can hinder color perception, while LED lamps provide a fuller spectrum of visible light, enhancing visibility and safety in street lighting contexts. Thus, LEDs are often preferred for modern street lighting due to their energy efficiency, longer lifespan, and better color rendering.