You can get smaller wattage heat bulbs in the reptile section of Petsmart. Any pet store with good reptile supplies should have them. I have several, ranging from 150 watts down to 50. I change them out as the chicks get older and the ambient temperature gets hotter. You can also moderate the temperature by moving the heat lamp farther away.
Make sure the chicks always have space that's NOT under the heat lamp. Broody hens will take young chicks out in the snow. The chicks need a warm safe place to run to when they need it. They also need to be able to cool off. They will be much healthier if they have temperature options.
I use a Sweeter Heater or Ecoglow in my outdoor brooder, along with the heat lamp. The Sweeter Heaters and Ecoglows need ambient temps over 50 degrees to keep the chicks warm enough. My brooder is outside so I have the heat lamp for cold weather. My heat lamp is on a thermostat. (Thermostat is designed for reptile heat pad. It plugs in between the heat lamp and the power source, like an extension cord. I put the temperature probe at chick level in a far corner of the brooder.) In cold weather I have the heat lamp on the thermostat. In hot weather (100+) I pull out the heat lamp and put the Sweeter heater on the thermostat, setting it to turn off if the brooder temp goes over 75-90 (depending on age of chicks). I do raise a lot of chicks. 65 last year. Hopefully not so many this year.
Good luck with your new adventure!
