Use your actual inputs
Material densities and operating factors are editable planning assumptions. Replace them with supplier data or measurements for the configuration you intend to use.
Lighting, Beam & Battery Calculators
Plan lighting quantities, beam coverage, electrical loads, battery capacity and DC voltage drop using clear editable assumptions.
How this calculator works
Lighting uses the lumen method. Beam diameter = 2 × distance × tan(full beam angle / 2). Battery Ah = load Wh × margin / (bank voltage × usable discharge × efficiency).
Keep calculations inspectable
Inputs, units and results are shown together. Save a CSV or print the calculation to share your planning assumptions.
Need help with an RST product or a custom configuration? Discuss your requirement ↗
Does a beam estimate replace photometric data?
No. The beam tool assumes uniform light within a circular cone. Real centre intensity and distribution require manufacturer candela data or an IES/LDT file. The lumen method does not model shadows, glare, uniformity or exact fixture spacing.
Why can measured battery runtime differ?
Battery age, temperature, discharge rate, BMS limits and inverter standby power affect usable energy. This energy model excludes Peukert behaviour and does not specify cable, protection or emergency-lighting compliance.
Technical context: battery capacity and discharge-rate effects.
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