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ColourCRI β€” Colour Rendering Index

CRI β€” Colour Rendering Index

How faithfully a light source reveals the true colours of objects and skin tones.

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ColourCCT β€” Correlated Colour Temperature

CCT β€” Correlated Colour Temperature

The warmth or coolness of white light, measured in Kelvin β€” sets mood and alertness.

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Light LevelIlluminance (Lux)

Illuminance (Lux)

The amount of light actually falling on a working surface β€” the core brightness metric.

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ComfortUGR β€” Unified Glare Rating

UGR β€” Unified Glare Rating

A measure of visual discomfort caused by overly bright light sources in the field of view.

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Light LevelLumens β€” Luminous Flux

Lumens β€” Luminous Flux

The total light a fixture puts out β€” separate from lux, which is what actually lands on your desk.

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ComfortFlicker

Flicker

Rapid, often imperceptible fluctuations in light output that can still affect the body.

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Light LevelUniformity

Uniformity

How evenly light is distributed across a space, rather than pooling in bright and dark patches.

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HealthMelanopic EDI β€” Circadian Stimulus

Melanopic EDI β€” Circadian Stimulus

The part of light that regulates the body's internal clock, alertness, and sleep cycle.

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Light LevelVertical Illuminance

Vertical Illuminance

Light measured on vertical surfaces β€” faces, whiteboards, walls β€” not just the desk.

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HealthExposure Duration

Exposure Duration

How long occupants spend under a given lighting condition each day.

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StandardEN 12464-1 β€” Why These Ranges Exist

EN 12464-1 β€” Why These Ranges Exist

The lighting-for-workplaces standard behind the recommended ranges in this reference.

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GuideComparing Environments by Age Group

Comparing Environments by Age Group

Why a kindergarten playground and a secondary school lab need very different light.

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