EasyAssistant Engineer (Electrical), Class-2, Road and Building Department2025✓ Editorially verified

Which lamp technology is currently the most energy-efficient and widely adopted for new street lighting projects?

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Answer & Explanation

Correct AnswerD. Light Emitting Diode (LED)

Quick Explanation

LED luminaires are the dominant high-efficiency choice for new street-lighting projects because they provide high luminous efficacy, long life, controllability, good optical directionality and lower maintenance compared with legacy discharge lamps.

Formula / Key Relation

Energy use ≈ lighting power × operating hours

Higher luminaire efficacy (lm/W) → less electrical power for required light output

Detailed Explanation

Concept & Reasoning

HPS, mercury-vapor and metal-halide technologies were widely used historically, but LED systems reduce energy and maintenance costs and support dimming/remote controls. Actual performance depends on luminaire efficacy, optics, thermal design and driver quality.

How to Solve It in the Exam

Modern new street lighting → LED.

Important Exam Point

Compare complete luminaire performance, not only lamp wattage.

Related Revision Path

This question sits in the revision path Building Electrical Services → Lighting → Street Lighting .

Quick Trick

Modern new street lighting → LED.

Common Mistake

Selecting HPS because it was historically common and efficient among discharge lamps.

Exam Tip

Compare complete luminaire performance, not only lamp wattage.

SEO + Knowledge GraphRelated PYQs & Exam ContextExam path, knowledge path and deeper practice links.

Exam Path

Knowledge Path

Study concept · LED Street Lighting →Practice concept Practice topic

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Assistant Engineer (Electrical), Class-2, Road and Building Department2025Q. 292