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Definitions (28)

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DALI


(Digital Addressable Lighting Interface)
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A standardised protocol for digital control


Failure fraction – Fy
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LED


(Light-Emitting Diode) is a semiconductor light source. LED lights have long lifespans and high energy efficiency. The light is formed by electroluminescence.
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LEED


(Leadership in Energy and Environmental Design) is an international system for environmental certification for buildings. The certification focuses on reducing the use of resources such as land, water [..]
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LLMF


(Lamp Lumen Maintenance Factor)
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The light source’s maintained luminous flux at any given time


LMF
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LSF


(Lamp Survival Factor)
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Specifies the number of light sources that still shine in a facility at any given time


Luminaire Luminous Efficacy
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Luminaire power


Stated in watts (W) and is the total system power for a luminaire.
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Luminance


Indicates how bright a surface is dependent on the light reflected from an object in a specific direction. Measured in candelas per m2
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