g.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.
The LENI (Lighting Energy Numeric
Indicator) stands for the actual energy
consumption lighting system kWh per
square metre and year.
.
The LENI determined accordance with
the specifications the 15193 standard
(Energy performance buildings Energy
requirements for lighting). maintenance control)
– The area assessed (A)
LENI also takes charging energy for emergency lighting and
standby energy into account.
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
