Generally speaking a photographer will use two types of lights - Flash or Tungsten.
Flash is one that - well, flashes - the pros to this is that the photographer can freeze action and work quickly. Tungsten lights are on constantly like a lightbulb, so they get very hot but they mean you can see exactly what you are getting.
As a model there are a few pointers (please comment if you have any experiences with this!). Flash is good cos it can catch you with your eyes open but it also means you may have to do movements over and over again. Also some girls are fast blinkers which means your eyes tend to be closed or sleepy when the flash goes off.
Tungsten is used less these days as they get really hot but nevertheless some people like them cos they can see exactly what they will get. If you shoot under these conditions you need to be able to cope with the heat and treat your skin after because the heat and light can actually be quite damaging to the skin!