LED Light Management System for Energy Savings using
Daylight Sensors.
Sagar Raut
Prof. Meeta Bakuli
Prof.Vijaykumar Joshi
Department of electronics and
telecommunication
GHRCEM Pune India
Department of electronics and
telecommunication
GHRCEM Pune India
Department of electronics and
telecommunication
GHRCEM Pune India
ABSTRACT
Energy savings become very important
now days. The most waste of energy is caused
by the inefficient use of the electronics system.
A light has huge stake of the total energy
consumption. Existing light systems are outdated
and consume more energy, so introduces various
light control systems in market. Therefore, this
paper proposes an LED light management system
for energy savings using daylight sensors. The
proposed system utilizes daylight sensors and
PWM dimming technology in order to control
an LED light according to the surroundings and
external daylight. The proposed LED lighting
system controlling light luminosity in a space
including an installed light source and an external
light source can autonomously adjust the light
intensity value, if external light is sufficient
internal light level dimmed to required level which
reduces the energy consumption and gives energy
savings. We designed and implemented the
proposed system and measured total power
consumption to verify the performance. The
proposed LED lighting system reduces total power
consumption up to 50%.
Keywords
Daylight sensor, PWM dimming, energy savings.
I.INTRODUCTION
Energy-saving solutions have been
becoming increasingly essential in recent years
because of environmental issues such as climate
change and global warming. Environmental
problems are very important issues and these
problems are largely caused by the excessive use
of energy. A light accounts for approximately 20
percent of the world’s total energy consumption.
The LED lighting
device
consumes
50
percent of the energy consumption compared
to the fluorescent lighting device.
LED light management system utilizes
day light sensors and PWM dimming technology
in order to control an LED light according to the
user’s state and the surroundings. The system can
autonomously
adjust the
minimum
light
intensity value to enhance energy efficiency.
Current building control systems for controlling
electric light and daylight mostly use independent
manual control systems. Recently, advanced
systems have been introduced in the market that
utilizes daylight sensors to control electric lights
according to the amount of daylight entering the
space. These systems use a gross light level
measurement to control the dimming level of the
electric light.
All things considered, design goals of the
new LED light management system are as follows:
-The proposed LED light management
system should be autonomous.
-The proposed LED light management
system should be designed to enhance energy
efficiency.
Therefore, this paper proposes LED light
management system for Energy Savings using
daylight sensors. The proposed system can
controlling light luminosity in a space including an
installed light source and an external light source
autonomously and adjust the light intensity
value, if external light is sufficient internal light
level dimmed to required level which reduces the
energy consumption and gives energy savings.
This paper is organized as follows: in
Section II we discuss the proposed LED light
management system; in Section III we present
the system implementation in Section IV we
discuss some case studies and experiment; finally
in Section V we conclude the system.
II. PROPOSED LED LIGHT MANAGMENT
SYSTEM
We design the LED light management system with
a daylight sensor, and PWM based dimmable LED
driver. Before presenting the proposed system
with system architecture and important scheme,
we discuss the problem of the lighting system.
A. Problem statement
The basic operating principles of the proposed
system.
L min
Minimum light level;
L max
Maximum light level;
TL-H
Time for low light level to high
light level;
TH-L
Time for high light level to low
light level.
C. Light Intensity Control Algorithm
Fig. 4 illustrate a flowchart of a light intensity
control algorithm that requires a signal of light lux
level in space. The light lux level signal is
received from daylight photo sensor. The proposed
minimum light intensity control algorithm
automatically adjusts Lmin based on the
external light level in room. If external light is
sufficient controller starts increase in dimming. If
external light is low controller starts decrease in
dimming
Figure 1: Daylight/artificial light Interactive diagram
The proposed system basically controls
illumination intensity of a lighting device
according to brightness of surroundings. That is,
when the maximum value of illumination intensity
of a lighting device is Lmax and the minimum
value is Lmin, the illumination intensity becomes
Lmax, if external light is sufficient and becomes
Lmin, if external light is not sufficient. The system
maintains internal light level according to external
daylight. Sensor read and measures the
surrounding light, and converts the amount of light
to 1-10v electronic signal output.
Figure 3: Flowchart of Light Intensity control Algorithm
III.
IMPLEMENTATION
SYSTEM
AND
TEST
B. Overview of system
Figure 4: Implementation of proposed system
Figure 2: Overview of proposed system
The lamp light ON at full or dims to
maintain the lux level, light output regulates
according to the level of natural light. When nature
light is sufficient, light dims to minimum but never
switch off. Light level changed linearly with
respect to external and internal light level.
The proposed system consists of
dimmable LED driver; microcontroller unit;
daylight sensor assembly and LED module.
Daylight sensor senses internal light level and
gives voltage signal to microcontroller.
Microcontroller does computation on received
signal and controls the dimmable LED driver
output current. If external light is sufficient
microcontroller reduces the LED driver output
current to 50% and maintains the space light lux
level. The proposed system dimming works
linearly, so get good energy reduction throughout
day night cycle.
Fig. 4 shows the prototype and hardware
block diagram of the proposed system. The main
processor part uses 8 bit microcontroller. This part
plays a role in situation analysis, event processing,
and learning. This part optimizes the control and
state variables to adapt itself to the various
environments. To provide energy
saving
services mentioned above, daylight photo
sensor is needed basically. Sensor read and
measures the surrounding light, and converts the
amount of light to 1-10v electronic signal output.
Additionally, there is a potentiometer for end users
to set the brightness level, so that the daylight
sensor can read, measure the available natural
daylight against the target value, and calculate how
much artificial light is needed. This demand is
then converted in 1-10v signal, to be sent to the 110v dimmable LED drivers, who will then pump
up the right amount of light out of the LED. LED
driver part consists of current controller modules
for driving LEDs.
1) Office and Institution building
There is sufficient daylight available in a
institutions and office building. In these places,
Lmin is set according to the proposed light
intensity control algorithm.
2) Trains
There is sufficient daylight is available
while train is running in day. The internal light can
set to Lmin during daytime by using proposed
light intensity control algorithm.
B. Experiment and Results
In an experiment, we measured total
power consumption. Table 1 show the result of an
experiment. The proposed lighting control system
reduces energy consumption up to approximately
50%.
Table1: Performance test results
Output Data
External Light Condition
Load
PWM dimming signal is driving the LED
driver, which sets the output current value. By
changing the duty cycle of PWM signal according
to sensor output, can change the light lux level.
Ouput Power [W]
Dark
Bright
22 LED's 22 LED's
26.27
11.39
Output Voltage [V]
71
65.47
Output Current [A]
0.37
0.174
Input data
Input power [W]
Loss in [W]
Efficiency [%]
230Vac
30.14
13.92
3.87
2.528
87.16%
81.84%
V. CONCLUSIONS AND FUTURE WORKS
Figure 5: Floorplan of Test system
Fig 5 shows a floorplan of test system. The light
fallen on surface (internal artificial light +external
light) is measured through lux meter. Lux meter is
placed at 1.3 meter height. The LED driver used is
20W each with proposed system.
IV. CASE STUDY AND EXPERIMENT
A. Case Study
Energy savings become very important
now days. The most waste of energy is caused
by the inefficient use of the electronics system.
A light has huge stake of the total energy
consumption. However, since there are no such
low cost autonomous products considering both
energy efficiency and user satisfaction, the
existing
systems
cannot
be successfully
applied to institutions and corporate office
buildings. Therefore, we propose paper proposes
an LED light management system for energy
savings using daylight sensors. The proposed
system utilizes daylight sensors and PWM
dimming technology in order to control an
LED light according to the surroundings and
external daylight. The proposed LED lighting
system controlling light luminosity in a space
including an installed light source and an external
light source can autonomously adjust the light
intensity value, if external light is sufficient
internal light level dimmed to required level which
reduces the energy consumption and gives energy
savings. We designed and implemented the
proposed system and measured total power
consumption to verify the performance. The
proposed LED lighting system reduces total power
consumption up to 50%.
REFERENCES
[1] Jinsung Byun, Insung Hong, Byoungjoo Lee,
and Sehyun Park “Intelligent Household LED
Lighting System Considering Energy Efficiency
and User Satisfaction,” IEEE Transactions on
Consumer Electronics, Vol. 59, No. 1, February
2013
[2] Patent US 2014/0225512 A1 – “Electric light
and daylight control system with a dual-mode light
sensor,” Dagnachew Birru, Yorktown Heights,NY
(US); Eduard Johannes Meijer,Eindhoven (N
L).Aug.14 2014
[3]Patent US 7,111,952 B2 – “System to control
daylight and artificial illumination and sun glare in
a space,” Dragan Veskovic, Allentown, PA (US),
September 26, 2006.
[4] S. Matta and S. M. Mahmud, "An intelligent
light control system for power saving," in
Proceedings of the Annual Conference of the
IEEE Industrial Electronics Society, pp. 33163321, 2010.
[5] G. W. Denardin, C. H. Barriquello, R. A. Pinto,
M. F. Silva, A. Campos, and R. N. do Prado, "An
Intelligent System for Street Lighting Control and
Measurement,” in Proceedings of the IEEE
Industry Applications Society Annual Meeting, pp.
1-5, 2009.