The LED grow lights that you use inside of your grow will have to feed your plants the light that they need. You see, in the natural world they would be receiving sunlight that that features light from the entire range of light wavelengths. This ranges from Ultraviolet light, that humans can't see, to infrared, which is also invisible to humans. In between, there is violet, blue, green, yellow, orange, and red. Depending on the kind of growing and the cycle you are in, different portions of the spectrum will be important to you.