I've heard that it is nearly impossible to replicate the energy the sun provides for a plant with indoor lighting. Growing indoors is a trade-off... you lose that free source of amazing amounts of light energy, but you gain superior control over pests and security.

Having a strong, indoor gardening specific lighting system s important, if you want to even begin to approach the type of growth the sun's light will provide. Cannabis will suck up every bit of light you can throw at it.