wattage calculator

LED Flood Light Area & Wattage Calculator

Enter your site dimensions to get a wattage recommendation — based on IES RP-8 and EN 12464-2 illuminance standards for outdoor commercial and industrial applications.

Unit system:

Application Type Lux target auto-sets per IES RP-8 / EN 12464-2

Target Illuminance (lux) Editable — override the application default

Illuminated Area (m²)

Mounting Height (m) Higher mounting → wider beam, more uniform spread

Please complete all fields before calculating.

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Total Lumens Required

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Wattage per Fixture

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Fixtures Needed

Guangqi Lighting Recommendation

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Calculation method: Required lumens = Target lux × Area ÷ (CU × MF), where CU = 0.70 (coefficient of utilization) and MF = 0.80 (maintenance factor), per IES RP-8 standard. Guangqi flood lights are rated 130–140 lm/W at 4000K–5000K. Actual performance varies by mounting angle, surface reflectance, and site geometry. This tool provides a sizing estimate — for precise photometric design, contact our engineering team.