Ministry of Finance, Kingdom of Bahrain

Energy cost savings expectations exceeded by farWe have equipped…

BOMI Grundstücksgesellschaft mbH

... are pleased to realize that the announced savings exceed…

The Importance of Delivered Light

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Light output is an informal term for how much light a fixture…

The Trouble with Lumens

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The way that lumen output is traditionally measured, reported,…

What Exactly Is a Lumen?

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Light measurements can either be radiometric or photometric.…

Deficiencies of the Eye-Sensitivity Curve

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It is well understood that the eye-sensitivity curve underestimates…

How Many Watts Is That LED?

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Because of incandescent light bulbs, most people are used to…

Relative Photometry, Absolute Photometry, and Efficiency

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Despite its shortcomings for accurately representing the perceived…

General Lighting Example: The Downlight

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A client has asked you to specify lighting for the corridors…

Lensing, Filtering, Shading, and other Sources of Loss

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How much light a fixture delivers to a task surface depends on…

Cove Lighting Example: Directional Light

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LED lighting fixtures with integrated optics and lensing can…