Aaron Graves, PhDude (Replica)

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led panel calculator

Posted on February 16, 2026 by Admin

LED Panel Lighting Calculator

Use this tool to estimate how many LED panels you need for a room, along with total wattage, current draw, and monthly electricity cost.

Example targets: 300 (home), 500 (office/classroom), 750+ (detailed task areas)
Accounts for fixture/room efficiency (reflection and distribution losses).
Accounts for lumen depreciation and dirt accumulation over time.

How to Use This LED Panel Calculator

A proper LED panel layout is not just about making a room bright. It is about hitting a useful lighting target, controlling energy usage, and avoiding dark spots. This calculator gives you a practical first-pass estimate for:

  • Total number of LED panels required
  • Total installed power (watts)
  • Current draw at your supply voltage
  • Monthly and yearly energy cost
  • Lighting power density (W/m²)

The Core Lighting Formula

The tool uses a simplified lumen method. It starts with required lumens:

  • Required Lumens = Room Area × Target Lux
  • Effective Lumens per Panel = Panel Lumens × Utilization Factor × Maintenance Factor
  • Panels Needed = Ceiling(Required Lumens ÷ Effective Lumens per Panel)

Because lighting systems lose useful light through fixture optics, room reflectance, mounting height, and aging, the utilization and maintenance factors are included for a more realistic estimate.

Typical Lux Recommendations

Residential and General Spaces

  • Living room: 100 to 300 lux
  • Kitchen worktops: 300 to 500 lux
  • Bedroom: 100 to 200 lux
  • Garage/workshop: 300 to 750 lux

Commercial and Task-Oriented Spaces

  • Office desks: 300 to 500 lux
  • Classrooms: 300 to 500 lux
  • Retail display zones: 500 to 1000 lux
  • Precision task benches: 750 to 1500 lux
Tip: if your room has dark walls, high ceilings, or critical visual tasks, choose a higher target lux and/or lower utilization factor.

Choosing Better Input Values

Panel Lumens and Watts

Check actual product data sheets. Two panels with the same wattage can produce very different lumen output. Efficiency is often expressed as lumens per watt (lm/W). Modern quality LED panels commonly range from 90 to 140+ lm/W.

Utilization and Maintenance Factors

If you are unsure, use defaults like 0.80 utilization and 0.90 maintenance. For dusty industrial environments or poor reflectance interiors, reduce them slightly for a conservative design.

Electrical Planning Notes

The calculator estimates current draw from total power and supply voltage. This helps with circuit planning, driver sizing, and distribution layout. Always confirm with local electrical code and a licensed electrician.

  • Leave headroom on branch circuits
  • Account for driver inrush current, not just steady-state amps
  • Group fixtures logically for controls and maintenance
  • Consider dimming systems (0-10V, DALI, TRIAC, smart controls)

Quick Example

Suppose your room is 6 m × 4 m (24 m²), target is 500 lux, and each panel is 3600 lm / 36 W. With utilization 0.80 and maintenance 0.90, effective lumens per panel become 2592 lm. Required lumens are 12,000 lm, so you need 5 panels (rounded up). Installed load is 180 W.

Final Thoughts

This LED panel calculator is ideal for concept design and budgeting. For final projects, especially commercial or code-regulated installations, validate results using a full photometric plan and fixture IES files. Still, for quick decision-making, this tool gets you very close and helps avoid under-lighting or overspending.

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