You will probably start with the grow lights relatively far from the marijuana plants. However, you have to lower the lights so they get closer to the weed plants every day. Each day you should lower the grow lights by a couple of inches till the grow light reaches near the top of the marijuana plant but not so close that it would harm it. Ideally you would not want the grow lights to be any closer than two or three inches from the top of the marijuana plant. The actual distance that the light should be from the plant will be based on the efficiency of the light bulb, how good the light reflector is, and various other factors.
Bulbs
No matter what your light source is you will want to switch the bulbs for new ones after you use them for about half a year to a year. If you are using the light all day every day when it is in use then you should switch it for a fresh one after six months. If you have the light on for eighteen hours a day then switch it for a new one after nine months. If you just have the light on for half of the day then you can wait up to a year.
When you are replacing your light bulbs you will have to remember that there are three different types – universal, vertical, and horizontal. Universal bulbs work for both being placed in the vertical and horizontal positions but the others only work for their specified position. If you don’t know which one you will need then you should get a universal bulb because it will work effectively in both types of fixtures.
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