Growlights are made to replicate the sunlight. Ofcourse, the sun produces so much light that the colours of light that the sun produces can be replicated in the lamps but not the brightness. Even the colours that we humans can't see are very useful for a plant such as UV light and infrared light, ofcourse both those lights are bad for your skin if you get exposed to it for too long. The downside of the sun is that you can't manipulate the hours of light and darkness that you can with grow lights, and ofcourse the place where you live is also important if you grow outside. Growing outside is very nice too because you don't have the electricity bills that you need to pay. Ofcourse the downsides are the lower security and you have more chance of insects. Growing in a greenhouse isn't much different, in a greenhouse you can still hang a growlight and your plants can still enjoy the sun. Downside of growing into greenhouses is ofcourse, if you do have a growlight in the greenhouse, that does give a bright glow in a wide radius that can attract a lot of attention, and a greenhouse doesn't have the space that the wild nature has (That depends on the size of your greenhouse) Now with greenhouses it is possible to grow in winter too but the downside of that is that you have to keep it warm and with a growlight)
