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How much would solar street lights cost compared to regular street lights?
According to Enertia Engineering Ltd., a Enertia Solar Street Light costs 75$, while a traditional solar street light costs 170$. Compared to these solar lights, a regular street light costs 550$.
Are street lights indirect light?
yes yes
What is one way in which you can identify the elements that are used in various street lights?
By the colour of the light that they emit. Sodium vapour lamps produce yellow/orange light while Mercury vapour lamps produce white light.
What uses a light dependent resisitor?
Usualy nigh lights or cretin street lights :)
What are some artificial sources of light?
TV, street lights, House lights, computer screen
What is the use of photoresistors?
Photoresistors also known as light dependent resistor (LDR) are used to increase light intensity by decreasing resistance. This is applied to camera lights, street lights, solar street lamps.
How is light emitted from elements useful to scientists?
Elements, such a yttrium, have helped to create the lights that are used in televisions
What is causing light pollution?
light pollution is mainly caused by the glare of the city street lights. There is no way to prevent this from happening due to the fact that you can't stop the reflection of the lights on the street from reflecting back to the sky.
Do street lights switch off during night?
Street Lights stay on in the night as they have a light detection unit on the top, if the sensor falls under shadow it turns on.
What is automatic solar street light?
Solar street lights are raised light sources which are powered by solar panels generally mounted on the lighting structure or integrated into the pole itself. The solar panels charge a rechargeable battery, which powers a fluorescent or LED lamp during the night. Most solar lights turn on and turn off automatically by sensing outdoor light using solar panel voltage. Solar streetlights are designed to work throughout the night. Many can stay lit for more than one night if the sun is not in the sky for an extended period of time.
Describe several solutions to the energy waste associated with light pollution?
1. Turn the lights off (not good) 2. Use dim lights (not very good) 3. Design street lights properly so they send their light down on to the street and not up into the sky (best).
Who created the first street light?
Street lights date back thousands of years. As early as the 4th century Antioch had street lights. Street lights were also used in the 9-10 centuries by the Arab Empire. In 1417 in London Henry Bastien ordered lanterns to be hung on winter nights and by 1792 William Murdoch had installed gas lights in London. In the United States Ben Franklin helped with street lights and by 1816 Baltimore was the first city to have street lights.
