FEATURES	CONVENTIONAL STREET LIGHTS	SOLAR STREE LIGHT
Initial Investment	Low	High, because of high cost of solar panels, battery & LED lamp.
Environment	Less environment friendly, More pollution & carbon dioxide emission.	More environment friendly, No emission of gases or pollution.
Running & Maintenance Cost	High. Electricity cost is more expensive.	Low. Almost free as it uses solar light from the sun.
Safety	Low. Since there are wires involved,there can be a risk of short circuit or other accidents.	High, since no wires are associated.

For everyone, using the solar power LED street lights, here are few great advantages which you can also tell your friends and other family relatives so that they can also think of going green and providing benefit to the environment as well.

The Advantages of Using Solar Street Lights:

1) Low Cost – Since solar lights use light from the sun for its operation, it is independent of the power grid. The cost is much lower as compared to electricity costs.

2) Clean and Green – The solar lights are an environment friendly way of lighting up the streets. They use clean energy from the sun for their working, hence there is no pollution and more energy saving.

3) Safe – Unlike the conventional street lights, there are no wires associated with the solar street lights and so there is less risk of accidents.

4) Low Maintenance – The maintenance associated with solar lights are very less as compared to the other street lights.

If you need more information please, don’t hesitate to contact us. Our staff will be glad to help you in any your requirements.

Scientific facts:

1. Scientists at the Lawrence Berkley Laboratory (LBL) developed the concept of scotopic lumens. They developed a factor called P/S ratio. This ratio helps convert traditional Lumens into actual lumens perceived by the eye under mesopic light conditions and gives a more accurate estimate of the amount of light.
2. Pupil Lumens = Photopic Lumens *

[S/P] 0.78

Here are some types of lights with their traditional and pupil lumens

Source of Light	Watt	Lumens	Lumens/Watt (Photopic Lumens)	S/P Ratio (correction factor)	Pupil Lumens	Pupil Lumens/Watt
Low Pressure Sodium	250	32500	130	0.2	9250	37
High Pressure Sodium	365	37000	101	0.62	25530	70
Metal Halide	455	36000	79	1.49	48960	108
T8 Fluorescent (3000 K)	36	2800	78	1.13	3080	85
LED Light	15	1500	100	1.9	2475	165

• LED S/P ratio is about 3 times higher than it is for HPS.
• A good general idea of what wattage of LED will replace an equivalent HPS wattage , is to divide the HPS wattage by 3.

 

Some Examples

Lumen output is not the only parameter that should be taken into account when replacing HPS fixtures with LED fixtures.

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