UGR is a glare index used in interior lighting discussions.
UGR means unified glare rating. It is a glare-design concept for visual comfort, not a result that this public site calculates from simple room inputs.
Technical meaning
UGR means unified glare rating, a visual-comfort concept that depends on observer position, viewing direction, luminaire brightness and room conditions.
A UGR value belongs to a defined lighting layout and view condition, not to a lamp or room name by itself.
Calculation use
UGR language helps flag when a simple lux estimate needs glare review before it can be treated as an interior lighting design.
Office, classroom and screen-based work notes can note glare risk separately from maintained illuminance and fixture count.
Not the same as
UGR is not calculated on this public site from simple room inputs.
UGR is not a compliance promise. A project value depends on photometry, layout, surfaces and the observer positions being assessed.
Australian context
Australian workplace lighting discussions often pair maintained illuminance with visual comfort, screen reflections and glare review, especially in offices and learning spaces.
Examples
Example
Value
Planning note
Desk view
Observer seated
The glare question depends on the view direction from the work position, not only on room size.
Bright bare fitting
Higher glare risk
High luminance in the field of view can be uncomfortable even when the lux target is met.
Shielded office layout
Review still needed
Diffusers, cut-off and layout can reduce glare risk, but a public glossary note does not verify the project value.