Indoor Lighting Calculator
Illuminance, uniformity and glare for offices, workshops and warehouses to EN 12464-1.
m
ft
Visual task
Context modifiers — raise the target one step each
Little or no daylight
Older workers or reduced visual acuity
Small detail or low contrast
Unusually long task duration
Room
Preset
Width
10.0
Length
15.0
Room height
3.00
Ceiling ρ
0.70
Walls ρ
0.50
Floor ρ
0.20
Luminaire
Panel
Linear
Highbay
Downlight
Panel width
60
Panel length
120
Luminaire length
100 cm
Body width
8 cm
Diameter
40
Calculation plane above floor
Height above the calculation plane
2.50 m
Luminous flux (lm)
15000
Power (W)
100
Luminous opening (% of body)
90
Layout
Columns (X)
3
Rows (Z)
3
Spacing X
3.80 m
Spacing Z
5.60 m
Space evenly across the room
Optics
Asymmetric distribution (different angle per axis)
Beam angle (FWHM)
110
°
Shielding / cut-off angle
150
°
Angle across X
70
°
Angle across Z
130
°
Calculation
Maintenance factor
Edge band excluded
0.50
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+
−
⟲
0
0
0
0
0
0
Ē maintained, lx
0
U₀ = Emin/Ē
0
UGR worst case
E min
0
E max
0
W/m²
0
lm/W
0
Room index k
0
Utilisation η
0
Ē direct
0
Ē indirect
0
Iso-lux contour lines
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Terminology
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