26
The Lighting Handbook
Energy efficiency buildings
The energy requirement the lighting is
also determined when issuing energy
performance certificate pursuant the
European Energy Performance Buildings
Directive. maintenance control)
– The area assessed (A)
LENI also takes charging energy for emergency lighting and
standby energy into account.
.
The LENI (Lighting Energy Numeric
Indicator) stands for the actual energy
consumption lighting system kWh per
square metre and year.
Formula for calculating lighting installation’s
energy consumption
LENI [kWh/(m² year)]
∑ (Pn FC) {(tD FD) (tN FO)}
A
Without elaborating individual parameters greater
detail, the following relevant factors are identified:
– The installed load (Pn)
–
Multiplied the annual hours use day (tD) and
at night (tN)
–
Reduced the factors for daylight-based control (FD),
presence-based control (FO) and constant lighting control
system (FC) (e.g.
The LENI determined accordance with
the specifications the 15193 standard
(Energy performance buildings Energy
requirements for lighting)
