I use the heat lamp. Just gotta watch it till you know the heat level you can really cook your babies and start a fire if your not careful, those bulbs can get really hot.
I use a heat lamp but just use a regular light bulb....60 watt. I adjust it up or down depending on what the chicks are doing. If they are all clustered under the lamp...they are too cold and I lower the lamp. It they are all over the edges of the brooder, they are too hot and I raise the lamp. If they are ok, they are sleeping all over. Those red bulb heat lights are way too hot for my brooder. They would be dead in minutes if I used one of those.