Data Center Electrical Calculator
Lighting Design Calculator (Lumen Method)
Calculate the number of luminaires needed for a target illuminance using the lumen method per EN 12464-1 / IESNA RP-20.
Design Inputs
Results
Room Area
24.00 m²
Total Lumens Needed
9600 lm
Luminaires Required
7
Lumen method per EN 12464-1 / IESNA RP-20. Utilization factor depends on room reflectances and luminaire distribution — confirm with the manufacturer's photometric data for a final layout.
Explore more calculators
Conductor Sizing
Four independent IEC/IS-aligned sizing tools in one place — HT cables, LV cables, busducts and earthing conductors — each checking ampacity, voltage drop, and short-circuit withstand rather than giving a rough estimate.
Transformer Sizing
Size a power transformer to the nearest standard IEC 60076 kVA rating from connected load, power factor and spare capacity, with primary and secondary full-load current.
UPS Selection
Size a UPS system across Single, N, N+1, Distributed, 2N and 2(N+1) redundancy philosophies, with losses, battery charging load, and standard kVA rating libraries.
Generator (DG) Sizing
Size a standby diesel generator set per ISO 8528, sized on the larger of steady-state running load and the voltage-dip-limited starting requirement of the largest motor.