Which type of LEDs is a good source of light and can replace the sun
get some 3000 kelvin (this is often called a warm yellow, or orange/yellow) colour temperature "White" LEDs, such as those from Cree, and take vitamin D supplements :). The LED matrix with about 100W of LED should be more than enough to light up a good area. Also think about putting a diffuse/cover over the LED so they are able to spread the light better. And use a reflector so you do not waste light "backwards".