I wanted a way to put some additional light on small subjects, so I purchased a Manfrotto light. I wanted something that was light, easy to pack, and easy to handhold in one hand while I took a picture with a camera in the other hand. I just tried it and it works great. The light has multiple levels of intensity and is very easy to carry in a pocket and use.
The first picture shows you the relative size of the light and the second is a picture that I made without the light. The last picture was made with the light. It enabled the camera to use a faster shutter speed and smaller aperture. I want to use the light this way to put the emphasis on particular areas, generate nice shadows, and darken the background while increasing the depth of field.