Welcome to BYC! Please make yourself at home and we are here to help!
Good luck with your future chicks!
You really can use any size bulb for your chicks just as long a they are kept warm. Some people use huge bulbs such as a 250 watt whereas others, like myself, only use a 60-100 watt bulb. Just remember these temp guidelines:
1st week: 95-90 degrees F
2nd week: 90-85 degrees F
3rd week: 85-80 degrees F
4th week: 80-75 degrees F
You probably will have noticed that each week you need to decrease the temp in the brooder by 5 degrees. Hopefully, by the 4th, 5th or 6th week, you can remove the heat source since the temp in the brooder will be the same as room temp.
Like @doc637 said, red bulbs are a good choice as they have been proven to reduce pecking/cannibalism and even keep chicks more comfortable.
Hope this helps! Be sure to check out our learning center!
https://www.backyardchickens.com/atype/1/Learning_Center
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