I used TWO bulbs.
One is this kind and one the red light. Though the red is very dangerous. If they're fully feathered two of this kind might work and be safer. They come in various wattage I believe. Why two? Because I've had bulbs burn out and I've lost chicks.
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Just a quick warning on these - they are called ceramic heat emitters and they get HOT. I have one for my bearded dragon. They should not be used in a fixture that has a plastic place where the bulb screws in, only ones that have ceramic. They get so hot they can melt the plastic.