Page 82 - GRIHA Manual Volume II - Introduction to National Rating System
P. 82
74 GrIha Manual: Volume 2
may have operating schedules that vary from each other. Most prevalent practice of manually
switching the lights on and off is not the most efficient way of controlling lighting. It usually results
in lights left switched on during the day or early evening when there is no requirement. Therefore,
exterior lighting should be controlled using appropriate controls.
Types of controls
timers: These are the simplest type of controls
and are most popular. Some areas in buildings may
require lighting for specific durations like security
lighting, landscape lighting or building floodlighting.
Timers allow this type of control by switching ‘on’ and
‘off’ as per preset times. These can have one setting
(same time) for the whole year or several (seasonal/
weekly/daily) settings to take care of the changing
sunset times.
photocell outdoor lighting control: This type of
control turns lights on and off by sensing daylight
levels. Main application of these controls is for
security purposes where lighting is required for the Figure 1 Timer
duration when enough daylight is not available.
These can be used in conjunction with the timer
controls for controlling lights that are required during dusk and can be switched off at night.
Use of solar energy for out door lighting
Two ways in which solar energy can be used for powering exterior lighting are by using stand alone
solar lights or by using electricity generated by a solar photovoltaic system installed on the building
site/roof/facade.
Stand-alone solar lighting
Use of solar energy to power outdoor lights using stand-
alone solar photovoltaic systems, is a technology that has
been successfully demonstrated all over the world. Solar
lights are a commercially available PV technology in Indian
market. A typical commercially available solar light system in
India comprises the following.
# 74 Wp solar PV module
# 12 V, 75 Ah tubular plate battery with battery box
# Charge controller-cum-inverter (20–35 kHz)
# 11 watt CFL lamp with fixtures
# 4–5 metre mild steel lamp post above ground level with
weatherproof paint and mounting hardware
Stand-alone solar lighting is a simple and safe method to
power exterior lights as they require no wiring or transformers.
The solar PV modules produce electricity during the day Figure 2 Stand-alone solar light
may have operating schedules that vary from each other. Most prevalent practice of manually
switching the lights on and off is not the most efficient way of controlling lighting. It usually results
in lights left switched on during the day or early evening when there is no requirement. Therefore,
exterior lighting should be controlled using appropriate controls.
Types of controls
timers: These are the simplest type of controls
and are most popular. Some areas in buildings may
require lighting for specific durations like security
lighting, landscape lighting or building floodlighting.
Timers allow this type of control by switching ‘on’ and
‘off’ as per preset times. These can have one setting
(same time) for the whole year or several (seasonal/
weekly/daily) settings to take care of the changing
sunset times.
photocell outdoor lighting control: This type of
control turns lights on and off by sensing daylight
levels. Main application of these controls is for
security purposes where lighting is required for the Figure 1 Timer
duration when enough daylight is not available.
These can be used in conjunction with the timer
controls for controlling lights that are required during dusk and can be switched off at night.
Use of solar energy for out door lighting
Two ways in which solar energy can be used for powering exterior lighting are by using stand alone
solar lights or by using electricity generated by a solar photovoltaic system installed on the building
site/roof/facade.
Stand-alone solar lighting
Use of solar energy to power outdoor lights using stand-
alone solar photovoltaic systems, is a technology that has
been successfully demonstrated all over the world. Solar
lights are a commercially available PV technology in Indian
market. A typical commercially available solar light system in
India comprises the following.
# 74 Wp solar PV module
# 12 V, 75 Ah tubular plate battery with battery box
# Charge controller-cum-inverter (20–35 kHz)
# 11 watt CFL lamp with fixtures
# 4–5 metre mild steel lamp post above ground level with
weatherproof paint and mounting hardware
Stand-alone solar lighting is a simple and safe method to
power exterior lights as they require no wiring or transformers.
The solar PV modules produce electricity during the day Figure 2 Stand-alone solar light
