Obviously the best way to grow any plant is in the sun and out in nature. Even though outdoor growing has it’s own set of complications and risks to your plants, it is the most natural and organic way to grow.

That being said there are two schools of thought when it comes to indoor growing and the lights used. Indoor LED grow lights and HPS or High-pressure sodium lamps. Each side will argue that one or the other is the est, but as in almost everything else, it boils down to a matter of opinion and preference. To formulate your own opinions and ultimately make your personal desicion, you have to know exactly what each style of light offers.

HPS lights – The benefit of high pressure sodium lamps to the horticultural industry is their ability to enhance the fruiting and flowering process in plants. Orange/red spectrum HPS is the spectrum plants use in their reproductive processes, which generally produces larger harvests of higher quality herbs, vegetables, fruits or flowers. Sometimes the plants grown under these lamps do not appear very healthy (although they usually are). This is due to the poor color rendering of high pressure sodium, which makes the plants look pale, washed out or nitrogen starved. Benefits to high pressure sodium lighting are their incredibly long usable bulb life (up to two years in many cases); and unparalleled efficiency at six times more light output per watt of energy consumed than a standard incandescent grow lamp

LED indoor grow lights – Recent advancements in LEDs have allowed for the production of relatively cheap, bright, and long lasting grow lights that emit only the wavelengths of light corresponding to chlorophyll’s absorption peaks. These lights are attractive to indoor growers since they do not consume as much power, do not require ballasts, and produce a fraction of the heat of HID lamps. There are four chlorophyll absorption peaks and LED grow lights use four different types of LEDs to hit all four peaks (two red and two blue). It should be pointed out that there is no peer reviewed scientific evidence supporting the claims of higher growth rate using LED grow lights versus HID lighting; however a number of non-scientific grow tests can be found online.

Either type of light is normally used in conjunction with a reflector, to control and intensify the light emissions, and will include an electrical ballast to control the current to the light. This is required because of the high intensity of the light that is necessary to produce something akin to sunlight.

I found this information on different wesites and there are thousands more to read and learn from. There are even forums and chat rooms where you can get involved in conversations with people who have grown a wide variety of plants with many different types of lights and therefore also glean from their experience.