LENI - Lighting Energy Numeric Indicator

Energy consumption of lighting systems calculated according to EN 15193. The LENI (Lighting Energy Numeric Indicator) represents the actual energy consumption of a lighting system in kWh per square metre and year.

Calculator

Inputs

Installed Load (Pn) (kW)

Daylight Control Factor (fc)

Annual Hours of Use by Day (td) (h)

Present Based Control Factor (fo)

Constant Maintenance Control Factor (fd)

Annual Hours of Use by Night (tn) (h)

Area (A) (m²)

Results

LENI Result-- kWh/(m² year)

Total Annual Consumption-- kWh/year

Parameter	Symbol	Value	Unit
Installed Load	Pn	5.0	kW
Daylight Control Factor	fc	0.9	-
Annual Hours of Use by Day	td	4000	h
Present Based Control Factor	fo	0.95	-
Constant Maintenance Control Factor	fd	0.95	-
Annual Hours of Use by Night	tn	2000	h
Area	A	100	m²
LENI Result	LENI	10.21	kWh/(m² year)