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In Sahand 12 Watt LED street lamps manufactured by Shayan Electric Group designed for lighting local passages, 1st degree arteries and 2nd degree arteries, according to National Standards 1-14878 and 3-2-14878 and according to the specifications of Journal No. 614 They have been manufactured, trying to achieve maximum efficiency and quality by using quality parts and minimizing losses. Also, using lenses that are specific to street lighting and have both symmetric and asymmetric types, it has been attempted to produce only the scattered light and distribute it on the street.
Also, the light emitted by these lights is in the visible wavelength range of 380 to 780 nm and therefore does not cause harmful and useless non-visible light waves. However, light sources with gas lamps convert part of the electrical energy into invisible waves that will have no effect on the light and are even dangerous to human health.
In LED street lights, due to the continuous wavelength characteristic of the light spectrum near the sun, the color resolution coefficient (CRI) is more than 80, while in lights with sodium vapor lamps less than 30 and in lights with lamp metal halides about 60. is.
Finally, it can be concluded that in LED street lights the light emitted to the surface (the useful light) is the same amount of electrical energy input to the light with little loss.
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