There is no reason to put together a concert lighting system, since those sorts of places tend to have a very good lighting system already in place and crew to work them for you. What you need is something that allows you to play anywhere, any time and have your own lights. Minimum requirements You need to be able to see and be seen. If you are a single or duo act, one light might be enough. White lights, while great to read by, are not very effective in projecting any kind of mood or atmosphere.
Colors are far more useful.
Given the possible colors, the ones typically sold in the form of 25 colored light bulbs or 100 watt flood lights are Red, Blue, Green and Yellow. The colored flood lights are highly directional and are far more rugged, however, they tend to be too bright. Both have the advantage that they are easy to find, are fairly inexpensive and don't require any kind of special fixtures or power sources. With this in mind, lets look at using flood lights. Leaving the lights in fixtures while traveling tends to cause the filaments to break.