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Spec explained

What a lumen means, and how watts mislead us

Reviewed under Eng. Abdullah Al Balushi

“Don't buy a lamp by its watts. Watts measure electricity, not light! Surprised? Let me explain.”

The problem

The client buys a 50 W spotlight expecting it to be powerful, then finds that a 20 W spotlight from another company is brighter.

Technical explanation

The lumen is the measure of actual light output. Efficiency is measured in lumens per watt (lm/W). The higher the efficiency, the more light you get for less electricity.

The result

A lower electricity bill and a brighter villa.

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Guide values; the final decision rests with a qualified engineer under the applicable code.

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