Why Do We Need Light?

Answer

Light has a very vital role in our everyday life. It is used to illuminate objects and to guide our way in the dark. Light is also very essential in transportation as it guides drivers, pilots and sailors as they navigate. Without light from the sun, plants would not be able to manufacture food required for their growth and survival.
Q&A Related to "Why Do We Need Light"
Human vision is possible due to the ability of the eye to sense light. When a light source such as the sun strikes an object, the object reflects certain wavelengths of light and
http://www.ehow.com/how-does_5025645_see-light.htm...
Well... I'm going to start by saying that I really don't understand most of what you've written in the question details. Physicists have an allergic reaction to things like that.
http://www.quora.com/Speed-of-Light/Why-do-we-thin...
Well the light bounces off the item back to your eyes. A red substance reflects back only red light yellow only yellow and so on.
http://wiki.answers.com/Q/How_do_we_see_with_light
We Are The Light Lyrics:People Light up your light tonight I wanna see you
http://www.chacha.com/question/what-are-the-lyrics...
2 Additional Answers
We need light to see when it is dark outside. If we did not have light we could easily stumble and get hurt, or be attacked by wild animals.
We need light just as much as plants do, but for different reasons. One is our internal body clock. Light regulates our internal clock and tells us when it's time to sleep and when it's time to wake up. It also prevents depression and illness. We need light to give us certain vitamins we need. You can find more information here: http://www.jsonline.com/features/29324864.html
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