Box Light\Spotlight\Point light doesn't work

[TheGreatCthulhu]

Do they work ingame when you step inside the box?
Do you have a large box light that envelopes them all? Try disabling that and see if the others appear (or setting it's Blend Function to "Add"). If all the boxlights have Blend Function set to "Replace", only one can be active at a time (each has a priority value associated with it).