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.
(a) 3 only
(b) 2 only
(c) 1 and 3 only
(d) 1, 2 and 3
Answer:
C
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Explanation:
Sodium lamps produce light in 360 degrees, meaning they emit light in all directions. On the other hand, LED lamps are directional and emit light in a specific direction. This directional nature of LED lamps allows for better light distribution and reduces light pollution compared to sodium lamps.
LED lamps have a longer lifespan compared to sodium lamps. LED lamps generally have a longer operational life, which results in reduced maintenance and replacement costs.
Sodium lamps produce a monochromatic light spectrum, primarily emitting yellow/orange light. In contrast, LED lamps offer significant advantages in terms of color options for street lighting. LED lamps can provide a wide range of colors, including white light, allowing for better visibility and color rendering.
Therefore, statement 1 and 3 are correct, while statement 2 is not. Hence, the correct answer is (c) 1 and 3 only.