Bulb for brooder?

[Beour3rd]

I started out using a Lrg plastic tote but found that the chicks when I added the feeder and water the chicks ran out of space to get away from the heat bulb when they needed to. I did have 17 chicks. I had an infar red heat bulb. I ended up moving mine to a large brooder outside.

im getting 34 chicks. how big should i go?!