LED Grow Light?

I saw a lot of people in different forum are talking about LED grow lights. I know those LED grow lights are kinda expensive and very useful for grow our plants indoor.

But I never heard this kind of light before, so I am just curious about some basic knowledge of it.

One of my friends in UK, bought a Lighting Ever LED grow lights like this. She said it's pretty good.

So this red light can just be as good as sunlight?

Maybe I will go back to some specific forum to ask.