This question was asked inGPSC AE (Electrical) Class-2 R&B Department Paper 2025 – Series MQuestion 172 of 179 published · Gujarat Public Service CommissionOpen paper
Q293EasyIllumination

In street lighting, the term 'luminaire' refers to

Answer & step-by-step solution
Correct answer: C. The complete lighting fixture including the lamp, housing and reflector
Quick explanation

A luminaire is the complete lighting unit/fixture: it includes the lamp or LED light source together with housing, optical components, electrical gear/driver and parts needed to distribute, position and protect the light source.

Luminaire = light source + optics + housing + control gear/driver + supporting fixture parts

Concept & Reasoning

The term is broader than 'lamp.' In modern LED products the source may be integrated and non-replaceable, but the complete fixture remains the luminaire. The supporting pole and underground cable are parts of the lighting installation, not the luminaire itself.

How to Solve It in the Exam

Lamp is inside; luminaire is the whole fixture.

Important Exam Point

Use precise lighting vocabulary in design/specification questions.

Quick Trick

Lamp is inside; luminaire is the whole fixture.

Common Mistake

Calling only the bulb the luminaire.

Solution diagram – In street lighting, the term 'luminaire' refers to
Exam tipUse precise lighting vocabulary in design/specification questions.
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