There are many arguments which can be given for switching to solar-powered street lighting. First of all they take power from sunlight, secondly they don’t give out any CO2 emissions, thirdly they render an off-the grid source of lighting during in an emergency situation and fourthly they employ efficient LED-based light which don’t direct insects towards it. Sharp Corporation has declared projects to roll-out two fresh models of solar-powered LED street lights. They are available in the Japanese market. These models are having the additional bonus of integral Seismic Motion detectors. These detectors can determine the existence of earthquakes of 5 or greater on the Japanese seismic scale. These detectors also react by changing over to full illumination for two nights.
The first solar energy LED Street light by Sharp was brought out in October 2005. The most advanced models put up an important betterment in luminosity. The 160W LN-LW3A1 is the powerful one. It features a luminous flux of 1,800 lumens. That is approximately six times greater than the former model i.e. LN-L19ZA. It has the equal capacity to give light output as of a regular 32-W fluorescent security light. This was claimed bySharp. The light is very bright. It could easily be distinguished the general facial features of a person on a dark street in night at a distance of equal to four meters.
The other model performs the same at a distance of 3.7m. The less effectual LN-LS2A1 model has a nominal output of 80 W, which is its best possible level. It features luminous flux of 1,200 lumens. Both of the above mentioned models employ Sharp’s proprietary solar (photovoltaic) electric components and high-intensity, long-lasting mercury free LEDs. It keeps on working about 10 years before they demand replacement. They require a 12 volt, deep-cycle, sealed lead battery. That renders sufficient power in reserve to produce the lighting for a week without sunlight.
In terms of cutting down gas emissions, Sharp guesses that the LN-LW3A1 model gets rid of approximately 48 kilogram of CO2 discharges per year. The comparison is made with the units (LN-LS2A1) power-driven by conventional utility sources, which eliminates 44kg per year.
The LEDs do not give off UV. This keeps down the number of insects that accumulated in the surroundings. While fluorescent or incandescent lights run to draw in insects because they make ultraviolet light in the 350nm wavelength range.
The power to detect earthquakes is especially applicable to the Japanese market. Sharp lays the Japanese market for fresh installations at about 100,000 per year. The seismic motion sensing element is placed in the support pole of the main unit. It turned on full nighttime illumination for two days, when it finds earthquake above five on the Japanese seismic scale.