Page 83 - GRIHA Manual Volume II - Introduction to National Rating System
P. 83
Sustainable site planning 75
using energy from incident solar radiation and charge the battery. This stored electricity is then
used to power lights during evening or night time as required.
Solar-powered lighting can be used for building exterior lighting purposes like lighting for
security, park, parking lot and walkways. Costs towards trenching and installation of underground
wiring, which is required in case of conventional outdoor lights compensates to some extent for
the higher cost of the solar lighting packs, thus making them economically feasible. Currently LED-
based solar-powered street lighting systems for outdoor lighting are available in the market. These
have high colour index and operating life of more than 50 000 hours.
On-site PV system
Electricity generated by an on-site solar PV system can also be utilized to power exterior light
fixtures of the required load. This solar PV plant can be designed exclusively for providing electricity
for exterior lights or else it can be sized for providing electricity for other end uses as well.
GRIHA-speciic information
Objective
Enhance energy efficiency of outdoor lighting and promote usage of renewable forms of energy
to reduce the use of conventional/fossil-fuel-based energy resources.
6.1 Commitment
6.1.1 Luminous efficacy of external light sources used for outdoor lighting shall equal or
exceed as specified in Table 6.1.
Table 6.1 Minimum allowable values of luminous eficacy of outdoor lighting system
Light source Minimum allowable luminous eficacy (lm/W)
CFL (compact luorescent lamp) 50
FL (luorescent lamps) 75
MH (metal halide) 75
HPSV (high pressure sodium vapour lamp) 90
LEDs (light emitting diodes) 50
6.1.2 All outdoor lightings to be fitted with an automatic on/off switch.
6.1.3 A minimum of 25% of the total number or 15% of the total connected load of outdoor
lighting fixtures (whichever is higher) to be powered by solar energy. Outdoor lighting
system includes
(i) security lighting
(ii) street lighting
(iii) landscape lighting
(iv) façade lighting
(v) parking lighting
using energy from incident solar radiation and charge the battery. This stored electricity is then
used to power lights during evening or night time as required.
Solar-powered lighting can be used for building exterior lighting purposes like lighting for
security, park, parking lot and walkways. Costs towards trenching and installation of underground
wiring, which is required in case of conventional outdoor lights compensates to some extent for
the higher cost of the solar lighting packs, thus making them economically feasible. Currently LED-
based solar-powered street lighting systems for outdoor lighting are available in the market. These
have high colour index and operating life of more than 50 000 hours.
On-site PV system
Electricity generated by an on-site solar PV system can also be utilized to power exterior light
fixtures of the required load. This solar PV plant can be designed exclusively for providing electricity
for exterior lights or else it can be sized for providing electricity for other end uses as well.
GRIHA-speciic information
Objective
Enhance energy efficiency of outdoor lighting and promote usage of renewable forms of energy
to reduce the use of conventional/fossil-fuel-based energy resources.
6.1 Commitment
6.1.1 Luminous efficacy of external light sources used for outdoor lighting shall equal or
exceed as specified in Table 6.1.
Table 6.1 Minimum allowable values of luminous eficacy of outdoor lighting system
Light source Minimum allowable luminous eficacy (lm/W)
CFL (compact luorescent lamp) 50
FL (luorescent lamps) 75
MH (metal halide) 75
HPSV (high pressure sodium vapour lamp) 90
LEDs (light emitting diodes) 50
6.1.2 All outdoor lightings to be fitted with an automatic on/off switch.
6.1.3 A minimum of 25% of the total number or 15% of the total connected load of outdoor
lighting fixtures (whichever is higher) to be powered by solar energy. Outdoor lighting
system includes
(i) security lighting
(ii) street lighting
(iii) landscape lighting
(iv) façade lighting
(v) parking lighting
