Definitely do NOT put an incandescent light directly over the seedlings, they'll fry in a heartbeat. If they're not getting any natural light, they may end up leaning toward the light, but that will become obvious fairly quickly. If it happens then, yes, try to put them somewhere you can put the lamp directly overhead. As to how close to put the lamp, it's a tradeoff. Closer will give the plants more light, but also more heat. To start with, use the back of your hand, held there for 15-20 seconds, as rough guide. If it feels affirmatively warm after that time, it'll probably get too hot for the plants. Good ventiliation (a fan in the vicinity, not pointing directly at the seedlings) will help control heat buildup.

Let me add for clarity that the first time I wrote "directly above," I wasnt talking about the angle but the distance!