The purpose of this guide is to help beginners supply themselves with hemp using standard items from hardware stores. If enough people grow their own, trafficking in hemp will be eliminated and quality will greatly improve. This saves light for the plants, ideally, the only light absorber in the room is plant. The next step is to put lights in the room.
Fluorescents are the cheapest and most readily available.
Each bulb is rated at 40 watts. 5 sets of shop lights will give 5 or 6 plants enough light for good results. That's a total of 10 bulbs or 400 watts. The type of bulb does not really matter, wide-spectrum grow bulbs if you can get them are great but regular shop lights work fine. If the closet is already warm, some ventilation is required.