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 streetlights, sodium lamps have a longer lifespan than LED lamps.
3.The spectrum of visible light from sodium lamps is almost monochromatic, while LED lamps offer significant color advantages in street lighting.
Select the correct answer using the code given below:
Answer:
(c)
Newspaper/CA
CA
LEDs emit light for 180 degrees. This is typically an advantage because the light is usually desired over a target area (rather than all 360 degrees around the bulb). Whereas Sodium lamps emit light omnidirectionally. This means they emit light for 360 degrees, requiring fixture housings or reflectors to direct a large portion of the emissions to the desired target area. Hence, 1 is correct. LEDs have an extremely long lifespan relative to every other lighting technology. New LEDs can last 50,000 to 100,000 hours or more. Hence, 2 is not correct. Sodium lamps have the worst colour rendering of any bulb. They produce a dark yellow glow which is generally a very low-quality light. LEDs are available in a wide range of colour temperatures that generally span from 2200K-6000K (ranging from “warm” yellow to light or “cool” blue). Hence, 3 is correct. Therefore, option (c) is the correct answer.