You don't always need more than One Light to make a great image.
Here are twenty four examples of images that can be created with only one main light and whatever is at hand for fill or accent like a desk lamp, reflector, foam-core, etc. Or daylight as your main source with One Light for fill.
Please feel free to comment, ask questions, or start a conversation about technique below each image.
NOTE: Please be aware that not all images below are safe for work.