Can you tell if it's the bulbs that are broken or if the fixtures are damaged? As AHBD mentioned the bulbs can break/fail pretty easily so using a halogen flood light for basking is a good way to go. I've found them to be a bit more durable than the reptile specific lamps. Try the fixture with a regular household bulb just to make sure it's still functional so you know if you need a new bulb or a new fixture.