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> Appendix / Glossary / U
Unified Glare Rating. The stipulated value of UGRL states the glare limitation which must not be exceeded in an application. See also glare.
(of illuminance). Uniformity of illuminance is often required by photometric regulations for interior lighting to ensure a harmonious lighting situation. The formula symbol U0 defines the quotient of spatial minimum value and spatial average value of illuminance (see also average illuminance) in the visual task area to be analysed.
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(U) Ratio of the effective luminous flux ΦU incident on the effective area of a lighting installation to the sum of the luminous flux of all luminaires in the room ΣΦL. It is also the quotient of Utilisation Factor FU and light output ratio RLO:
The Utilisation factor FU is the ratio of the effective luminous flux ΦU incident on the effective area of a lighting installation to the sum of the combined luminous flux of all lamps in operation within the lighting installation Σ Φ0. It is also the product of Utilance U and light output ratio RLO.
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Introduction Visual needs Need for orientation Non visual needs
Guidelines Overview Work places Visual task area Surrounding area Illuminance Luminance distribution Limitation of glare Lighting direction, modelling Aspects of colour Flicker and stroboscopic effects Daylight
Maintenance Factor Light and safety at work Light and non-visual effects Light and economy Light and environment Lighting design Lighting measurement Emergency lighting
Lighting of traffic zones and geneal areas in buildings Lighting of industrial activities and crafts Lighting of offices and VDU workstations Lighting of design and CAD offices Lighting of sports facilities Lighting of health care facilities Lighting of geriatric care facilities and nursing homes Lighting of public areas Lighting of salesrooms Lighting of educational facilities Lighting of traffic areas Lighting of car parks Ligthing of further indoor spaces
Luminaires The enhanced concept of quality Photometric classification Photometric properties Photo biology safety Mounting and electrical connection Luminaire labelling Luminaire operation LED luminaire operation Operation of FL luminaires Electrical safety Fire protection Electromagnetic safety Mechanical safety Chemical and miscellaneous impact Acoustic properties Ventilation properties
Firehazardous locations Room with bathtubs and showers Swimming baths Exterior installations Agricultural and gardening plant locations Food industry Clean rooms Requirements on mediacal rooms Emergency light installations
Luminaire selection chart
Light management application and function Presence detection Daylight-dependent regulation Interfaces Building management, KNX and other bus systems
Light sources types Characteristics of light sources
ABC, DF, G, ILM, NO, P, QRSUV, W
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