Question
Download Solution PDFHigh-pressure mercury- vapour lamp emits:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDF- Generally high-pressure mercury- vapor lamp emits greenish-blue light. But from the options most probable answer is bluish-white color light.
- The mercury vapor lamp is a high-intensity discharge lamp. It uses an arc through vaporized mercury in a high-pressure tube to create very bright light directly from its own arc.
- Mercury vapor lamp is deficient in red light.
- It emits a characteristic greenish-blue light.
- It produces color distortion.
- It has an efficiency of about 40 lumens per watt.
Important:
Advantages:
- Good efficiency
- Color rendering is better than that of high-pressure sodium street lights
- Some lamps last far longer than the 24000-hour mark, sometimes 40 years
Disadvantages:
- Like many lamps, it contains traces of mercury which must be disposed of properly
- Human skin looks green under the light, it is poor for color film/photography
- The warm-up time required to start the lamp
Applications:
- Large areas like parks, street lighting, high ceiling buildings, and gyms.
Last updated on Jun 11, 2025
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