Solar Street Lights with LED luminaries, made more relevant.

GARDEN LIGHTS
Centre for application of renewable energy
SOLAR LED STREET LIGHTS
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SIMPLIFYING SOLAR STREET LIGHTS
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Why SOLAR Energy?
Th E th i 174 t tt (PW) f i i l di ti
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The Earth receives petawatts of incoming solar radiation
(insolation) at the upper atmosphere. Approximately 30% is reflected back to
space while the rest is absorbed by clouds, oceans and land masses.
The spectrum of solar light at the Earth's surface is mostly spread across
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Earth s the visible and near‐infrared ranges with a small part in the near‐ultraviolet.
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The total solar energy absorbed by Earth's atmosphere, oceans and land
masses is approximately 3,850,000 exajoules (EJ) per year.
hi i h h h ld d i
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In 2002, this was more energy in one hour than the world used in one year
Solar energy can be harnessed in different levels around the world.
Depending on a geographical location the closer to the equator the more
"potential" solar energy
SIMPLIFYING SOLAR STREET LIGHTS CENTRE FOR APPLICATION OF RENEWABLE ENERGY WEBSITE : HTTP://WWW.CARE‐INDIA.COM EMAIL CARE@CARE‐INDIA.COM

Why SOLAR Energy?
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AND THE ONLY REASON IS BECAUSE ………………….
THERE IS
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NO
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PLANET “B” or “C”…
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……..Coal, Oil and other SOURCES OF ENERGY AS WE KNOW
OF TODAY WILL EVENTUALLY RUN OUT

Sharing a little we know
Solar energy is a completely renewable resource This means that even when we
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resource. cannot make use of the sun’s power because of nighttime or cloudy and stormy
days, we can always rely on the sun showing up the very next day as a constant
and consistent power source.
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Oil, which is what most people currently use to power their homes, is not a
renewable resource. This means that as soon as the oil is gone, it is gone forever
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and we will no longer have power or energy.
Solar cells make absolutely no noise at all. They do not make a single peep while
extracting useful energy from the sun On the other hand the giant machines
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sun. hand, utilized for pumping oil are extremely noisy and therefore very impractical.
Very little maintenance is required to keep solar cells running. There are no
moving parts in a solar cell, which makes it impossible to really hurt them. Solar
cells tend to last a good long time with only an annual cleaning to worry about.
Solar powered panels and products are typically extremely easy to install. Wires,
cords and power sources are not needed at all, making this an easy prospect to
employ
employ.
CENTRE FOR APPLICATION OF RENEWABLE ENERGY WEBSITE : HTTP://WWW.CARE‐INDIA.COM EMAIL CARE@CARE‐INDIA.COM

Sharing a little we know and a little more
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Photovoltaics, or PV for short, is a solar power technology that uses
solar panels to convert light from the sun directly into electricity.
This Endless Energy resource (the Sun) will remain more or less the
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way it is now for about another 5 billion years
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How it works;
Solar lights use photovoltaic cells that absorb sunlight during the day
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and turn it into energy. Rechargeable batteries store the energy,
making it available at night when it is needed. LED (light emitting
diode) bulbs, which require little power and last 10 times longer than
incandescent bulbs, provide the illumination. There is no wiring
necessary to connect the lights to each other or to the electric grid. =
Electricity

A Little math would be in place too…..
I ld d b 300 600 900 L bl di h i i
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It would need about or 600or Lumens at reasonable distance to cover the premises is
debatable …. But we do need light.Which is not debatable..
Lets Assume that for a single Light …..
1 GARDEN LIG
Luminary * 12W(LED) (Providing about 1000 Lumens)
Used for 8 hours = 84 W per night..
Each Village needing 20 Lamps
M thl ti 50 5K h(U it )
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Monthly consumption 84* 30*20 = 50.5 Kwh (Units)
Annually 600 Kw… in Energy alone for a single village
Cost of Electricity on an average in India INR 6 per unit INR 3600/‐
l /
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Annual Expenses = INR 3600/‐
An investment of Rs 10,000 will give you free electricity for ……….near 25 years….
Return on investment is about 3 Years
600,000 villages As per the 2011 Census
IF WE INTEND TO LIGHT 10 % OF THESE VILLAGES…….6000 VILLAGES
Energy Needed = 6000 * 600= 3600MW at a cost of INR ` 2 16 crores annually
2.16 CENTRE FOR APPLICATION OF RENEWABLE ENERGY WEBSITE : HTTP://WWW.CARE‐INDIA.COM EMAIL CARE@CARE‐INDIA.COM

COMPARATIVE
Comparison GHTS
Chart
LED Lights vs. Incandescent Light Bulbs vs. CFLs
(LEDs) Incandescent Bulbs
Compact Fluorescents
(CFLs)
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Energy Efficiency &
Energy Costs
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Life Span (average) 50,000 hours 1,200 hours 8,000 hours
Watts of electricity
6 ‐ 8 watts 60 watts 13‐15 watts
used
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Light Output
Lumens Watts Watts Watts
450 4 to 5 40 6 to 8
800 8 to 9 60 13‐15
1,100 9 to 13 75 18‐25
1,600 16‐20 100 23‐30
2,600 25‐28 150 30‐55

Energy Efficiency & Energy Costs
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Comparison Chart
(Incandescent Bulbs
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LEDs) p
(CFLs)
Energy Efficiency &
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Energy Costs
Kilo‐watts of Electricity
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used (30 Incandescent
Bulbs per year
equivalent)
329 KWh/yr. 3285 KWh/yr. 767 KWh/yr.
Annual Operating Cost
(30 Incandescent Bulbs
per year equivalent) @
`6 Kwh
` 1974 ` 19710 ` 4602
/SIMPLIFYING SOLAR STREET LIGHTS

ENVIRONMENTAL IMPACT
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Comparison Chart
(LEDs) Incandescent Bulbs
(CFLs)
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Energy Efficiency &
Energy Costs
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Contains the TOXIC
Mercury
No No
Yes ‐ Mercury is very toxic
to your health and the
environment
contains 1mg 5mg of
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RoHS Compliant Yes Yes
No ‐ 1mg‐Mercury and is a major risk
to the environment
Carbon Dioxide
Emissions (30 bulbs per 451 pounds/year 4500 pounds/year 1051 pounds/year
year) CARBON FOOTPRINT

IMPORTANT FACTS
Comparison Chart Important facts
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(LEDs) Incandescent Bulbs (CFLs)
Energy &
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Efficiency Energy Costs
Sensitivity to low temperatures None Some
Yes ‐ may not work under
negative 10 degrees Fahrenheit
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or over 120 degrees Fahrenheit
Sensitive to humidity No Some Yes
On/off Cycling
No Effect Some
Yes ‐ can reduce lifespan
d ti ll
Switching a CFL on/off quickly, in
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a closet for instance, may drastically
decrease the lifespan of the
bulb.
Turns on instantly Yes Yes No ‐ takes time to warm up
Durability
Very Durable ‐ LEDs can handle Not Very Durable ‐ glass or Not Very Durable ‐ glass can
jarring and bumping filament can break easily break easily
Heat Emitted 3.4 btu's/hour 85 btu's/hour 30 btu's/hour
Failure Modes Not typical Some
Yes ‐ may catch on fire, smoke,
or omit an odor

A Little math would be in place too…..
600,000 villages As per the 2011 Census
GARDEN LIGHTS
IF WE INTEND TO LIGHT 10 % OF THESE VILLAGES…….6000 VILLAGES
Energy Needed = 6000 * 600= 3600MW
At a cost of INR ` 2.16 crores annually
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Not considered here is transmission cost laying of cables and the manpower need to
maintain the same day after day..
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A SOLAR LIGHT WOULD SOLVE THE TASK

Benefits
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• NO CABLES
• NO SHOCKS
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• NO DEPENDENCE ON GRID ELECTRICITY
• NO POWER CUTS
• NO DARKNESS
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• NO MAINTENANCE
• WATER PROOF SYSTEMS
• AUTOMATIC ON AND OFF AS PER LIGHT CONDITIONS
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CONDITIONS.

GENERAL BENEFITS of LED STREET LIGHTS
Less energy consumption
LED street lights use 40‐80% less electricity and have at least 5 times the life expectancy than regular High
P S di (HPS) fi LED l 7 i ffi i h i d d i
Pressure Sodium fixtures. lamps are times more energy efficient than incandescent and twice as
efficient as fluorescent lamps.
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Higher efficiency and low light pollution due to directional light
g y g p g
LED street lights with a lower lumen output can replace conventional lamps with a higher output. For example,
a 30W LED street light can often replace an 80W High Pressure Sodium lamp. The reason for this is
directionality. LED street lamps are very directional and the light output is much more even then by other
street lamps. Also there is little or no hot spot under the LED lamp. The light emitted from the LED lamp is
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directed downwards, spread throughout the entire area it covers. This means that a lower amount of light is
needed to properly illuminate the area. This also dramatically reduces light pollution, which affects the
mood of human beings, navigation in birds and insects, mating behavior in animals and flowering in plants.
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Long life – up to 100.000 hours
LED street lights last much longer than conventional lamps (3 to 8 times longer). This results in less expense
in replacing the lights themselves but also the labor to replace the lamp is needed less often. This provides a
great cost savings by itself.
Also the loss of brightness or lumen depreciation is slower over the life of an LED lamp than that of a sodium
or other lamp. So not only does the LED have a longer life span than the conventional lamp, but it stays
brighter longer than other lamps. The long life span reduces maintenance expenses and makes these bulbs
particularly suitable for difficult to reach locations and for streetlights where maintenance costs can be
significant.

GENERAL BENEFITS of LED STREET LIGHTS
Reducing carbon footprint
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The carbon footprint of LED street lights is smaller than other lights due to lower energy usage. Moreover
LEDs last 4 to 10 times longer than any other bulbs, further reducing the carbon footprint of manufacture over
the life time.
Dark sky friendly
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y y
Because of the directional light, light is carefully distributed exactly where it is meant to go and therefore
there is no or little light which is wasted by illuminating the night sky. This is a considerable plus especially if
the local community has a Darksky Initiative.
Natural light specter – Color Rendering Index
LED t tl ith l t t 3 500 4 200 K d i t lli ht th th ll f
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street lamps with color temperature 3.500‐4.200 are rendering more natural light than the yellow of
sodium lamps or green of flourescent streetlights. Alsono UV or IR radiation is emitted from the LED street
lamps. Color rendering index (CRI) is high (80‐90) and displays natural colors of illuminated objects.
Free of harmful substances and lower environmental impact when used up
LED luminaires contain no harmful substances, like mercury, lead or other hazardous chemical and gasses.
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Spent LED lamps can be thrown away without any special handling or disposal requirement,since they are
recyclable and environmentally friendly. Other light often have hazardous materials such as lead and mercury
which require special handling and waste management procedures which have both economic and
environmental costs.
Easily controllable
The light is easily controllable with intelligent systems. The light can be turned on and off instantly and can be
dimmed for added energy savings at dawn, dusk, and also during hours of low traffic. Switching on‐off and
dimming does not affect the life‐time of the luminaire as in the case of CFL lights.

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Solar Street Lights with LED luminaries, made more relevant.

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