Optic Selection Calculator

Select the optimal beam angle optic for any fixture, mounting height, and target area. Calculates beam coverage diameter, centre and edge illuminance, number of fixtures for complete coverage, and recommends the best optic type for your application.

Measurement units
Metric
Metres, lux
Imperial
Feet, foot-candles
Application — select for recommended beam angle
Museum / gallery
8-15°
Retail accent
15-24°
Retail general
36-45°
Office / commercial
60-90°
Hospitality
24-36°
Custom / other
set below
Setup parameters
Height of fixture above target surface
Diameter of illuminated area needed
Recommended beam angle
0°
0m
Beam diameter
0 lux
Centre lux
0 lux
Edge lux (50%)
0
Fixtures for coverage
Beam angle suitable
Beam cone diagram — mounting height and coverage
Optic options comparison
Beam angle comparison — same fixture and height
BeamDiam.Centre luxFixturesApplication
Optic selection guidance
Mounting height
Target area
Recommended beam angle
Beam coverage at height
Centre illuminance
Fixtures for full coverage
Optic type
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The calculators and tools on LightingCalc.lighting are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. LightingCalc.lighting makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.