URBAN | 7
To achieve effectiveness, indeed, the
lumen/Watt ratio has to be considered
together with the system lighting
requirements; the lighting fixtures have
to be evaluated for their capacity to
light up “only where is needed”, without
exceeding the light levels prescribed by
the regulations.
Italy has given a strong contribution to
this paradigmatic change by introducing,
with CAM, two new energy indexes: IPEA*
for fixtures and IPEI* for systems.
IPEA* (Italian acronym for “Parametric
Fixture Efficacy Index”) is an alphanumeric
value (ex. A++), similar to the energy class
of household appliances. Is given by the
result of the following ratio:
IPEA* = ηa / ηr
In which:
ηa (lm/W): fixture efficacy
ηr (lm/W): reference efficacy, dependent
on fixture type and power range
IPEI* (Italian acronym for “Parametric
System Efficacy Index”) is an alphanumeric
value too, similar to the energy class of
buildings. Is given by the result of the
following ratio:
IPEI* = Dp / Dp,R
In which:
Dp: project power density, calculated
according to EN 13201-5 regulation
Dp,R: reference power density, dependent
on project type and lighting class.
