Should be noted too, if you add to many pointlights -lights that can be turned on/off/flicker, etc- you'll get the dreaded Warning: Too many direct light styles on a face Error.
Usually, your map waill still compile/run with these, but it's not recommened, and among other things, will add dreadful amounts of time to your compile.
Last but not least, use textlights for any lighting that doesn't have to be dynamic.