A
A (Surface Area) Symbol representing a surface in geometry.
B
Background Area Borders the direct ambient area and extends up to the room's edges. Minimum width: 3m.
C
CCT (Correlated Colour Temperature)Defines light color based on a thermal radiator’s temperature, measured in Kelvin (K):
Warm white (ww): < 3,300 K
Neutral white (nw): 3,300 – 5,300 K
Daylight white (dw): > 5,300 K
Clearance Height Distance from the finished floor to the lowest ceiling point.
Control Group A set of luminaires controlled together for lighting scenes.
CRI (Colour Rendering Index)Measures color accuracy on a scale from 0 to 100.
D
Daylight Autonomy Percentage of working hours where daylight meets required illuminance.
Daylight Factor Ratio of indoor to outdoor daylight illuminance under overcast conditions.
E
Energy Evaluation Hourly calculation of daylight use and luminaire consumption.
Environmental Zones Defined areas for assessing intrusive light pollution.
Eta (η) (Light Output Ratio) Percentage of luminous flux emitted by a luminaire relative to its source.
G
g1 (Overall Uniformity) Ratio of minimum to average illuminance.
g2 (Non-Uniformity) Ratio of minimum to maximum illuminance (used for emergency lighting).
I
Illuminance (E)Luminous flux per unit area, measured in lux (lx).
Horizontal Illuminance (Eh): On a level surface.
Perpendicular Illuminance: At a right angle to a surface.
Vertical Illuminance (Ev): On a vertical plane.
K
kS (Glare Metric) Measures glare based on source angle, ambient luminance, and allowable luminance.
L
LENI (Lighting Energy Numeric Indicator) Defines lighting energy efficiency in kWh/(m²·a).
LLMF (Lamp Lumen Maintenance Factor) Represents luminous flux reduction over time.
LMF (Luminaire Maintenance Factor) Accounts for luminaire soiling.
LSF (Lamp Survival Factor) Reflects lamp failure rate over time.
Luminance (L)Perceived surface brightness, measured in cd/m².
Luminous Efficacy Luminous flux per watt (lm/W).
Luminous Flux (Φ)Total emitted light, measured in lumens (lm).
Luminous Intensity (I)Light intensity in a given direction, measured in candela (cd).
M
Maintenance Factor (MF)Ratio of maintained to initial photometric performance.
O
Obtrusive Light (Light Emission) Unwanted light causing physiological or ecological impact.
Operating Times Typical lighting hours: 06:00 – 22:00.
P
P (Power) Electric power consumption, measured in watts (W).
R
R(UG) max (Unified Glare Rating) Measures psychological glare in indoor spaces.
RDLO (Downward Luminous Flux Ratio) Percentage of light emitted below the horizontal plane.
RG (Glare Rating) Evaluates glare in outdoor lighting.
RUF (Upward Flux Ratio) Percentage of light emitted above the horizontal plane.
RULO (Upward Light Output Ratio) Ratio of upward light emission to total luminous flux.
Reflection Factor Proportion of incident light reflected by a surface.
S
Surrounding Area Borders the visual task area; minimum width: 0.5m.
V
Visual Task Area Defined workspace for performing visual tasks.
W
Wall Zone Peripheral area excluded from lighting calculations.
Working Plane Virtual measurement surface aligned with the visual task area.
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