I am the owner of a growing facility and a lot of marijuana growers want to recognize about my light rooms for growing! The lights when growing cannabis can be tricky.
A lot of it depends on the age of the plant, the temperature you want and what your growing facility tends to look like, for example, smaller cultivation facilities particularly should consider fluorescent lights.
They are cheap, don’t produce a lot of heat and should be inches from the plant. You can have short ceilings and extremely small area however still have a healthy crop. Young plants especially do well with the fluorescent. There are HID or high intensity discharge lights too. These lights are more efficient and wonderful for flowering plants. There are also less problems at hand when it comes from lighting distance to the crop, and however, HID bulbs get particularly warm and the heat can burn the plants easily, but what I use is LED grow lights. These are those green, psychedelic lights that you see, but my marijuana cultivation facility is big, with very spacious ceilings. This makes it wonderful for my LED lights, i don’t have to worry about the younger plants getting too hot, however just in case though, I do have an exhaust fan to vent out the heat. There is a small percentage of guesswork on how warm the bulb gets. They do have a cooling function built into the bulb that pushes heat upwards… So I am pretty set there. I assume that with LED lights you get a more resinous bud. I am particularly happy with my growing results. To each his own though.