An artist trying to illuminate 500 pieces of jewelry in cases has a different lighting objective than one trying to effectively light only eight to ten pieces. These are very different jobs, and each will require special equipment, or at least different bulbs. The color of your booth has an effect as well. Dark background colors in booths generally will require light, especially if there are many pieces on display. Consequently, what you are trying to illuminate and what display effect you are trying to create are important issues to consider before buying any equipment.
Some suppliers suggest using arm lights or lights supported by standards.
Track lighting is perhaps the most modular method, but it requires some form of a suspended pole for attaching the track. But if you do shows where you have no walls, it is difficult to use track lighting unless you provide some type of device to suspend the track. Keep in mind that electrical codes require that your track needs to be suspended eight feet from the floor. It is the belief of several lighting vendors I spoke with that three-wire systems can better endure the nomadic demands of craft exhibitors. Most craft show applications require a system designed to be nomadic.