Definitions of shorts appearing in the EuP draft study of 
Streetlighting


Lamp Survival Factor (LSF) (see also CIE 154): fraction of the total 
number of lamps which continue to operate at a given time under defined 
conditions and switching frequency. 

Lamp Lumen Maintenance Factor 
(LLMF) (see also CIE 154): ratio of the luminous flux emitted by the 
lamp at a given time in its life to the initial luminous flux.

Each luminaire has its own specific characteristics. The important
performance assessment parameters are (EN 12665 (2002)): 

Light Output
Ratio (LOR): ratio of the total flux of the luminaire, measured under
specified practical conditions with its own lamps and equipment, to the
sum of the individual luminous fluxes of the same lamps when operated
outside the luminaire with the same equipment, under specified
conditions (see IEC 50 (845/CIE 17.4).

 Downward Light Output Ratio
(DLOR): ratio of the downward flux of the luminaire, measured under
specified practical conditions with its own lamps and equipment, to the
sum of the individual luminous fluxes of the same lamps when operated
outside the luminaire with the same equipment, under specified
conditions (see IEC 50 (845/CIE 17.4).

 Upward Light Output Ratio
(ULOR): ratio of the upward flux of the luminaire, measured under
specified practical conditions with its own lamps and equipment, to the
sum of the individual luminous fluxes of the same lamps when operated
outside the luminaire with the same equipment, under specified
conditions (see IEC 50 (845/CIE 17.4). 

 Utilance (of an installation,
for a reference surface)(U)): ratio of the luminous flux received by the
reference surface to the sum of the individual total fluxes of the
luminaires of the installation (IEC 50/CIE 17.4).

Utilization Factor
(of an installation, for a reference surface)(UF=UxLOR): ratio of the
luminous flux received by the reference surface to the sum of the
individual total fluxes of the lamps of the installation (IEC 50/CIE
17.4). The reference surface in street lighting is of course the road
surface. Note that the UF is not only dependent on the luminaire itself
but also on the accordance between the light distribution and the
geometry of the road and especially on the exact installation of the
luminaire (putting into service). 


Luminaire Maintenance Factors (LMF) (further explained and used in chapter 4).
 (... not much explained, but it's an analogy to LLMF. Can be regarded for  
  4 years, or for the time, when lamp is replaced. Can reach 0.95.)

Ballast Maintenance Factor (BMF) is the ratio of the worst ballast
efficiency at a  given time in its life to the initial ballast
efficiency in standard  conditions. (The study assumes it to be 0.95 for
magnetic and 1.00 for  electronic ones.)

Ballast Gain Factor (BGF) can be over 1 if dimming is employed (the 
study assumes it being done by ballast itself). Dimming enables 
reduction of power for new lamps and luminaires (the study assumes 1.2 
for bi-level and 1.6 for electronic dimming). In fact, continuous 
dimming reduces power consumption also in case of overvoltage (mere
stabilization is needed in this case).