I am using a Brinsea 20 in my brooder. I understand how you regulate brooder temp when using a heat lamp, but not with the Brinsea. How do you lower the temp 5 degrees each week with the Brinsea?
I just got mine and haven't used it yet. But, my understanding is that the chicks will just naturally spend less time under it as they get older and need less heat- just like they would do with a momma hen.
You don't lower the temp each week. I don't know where that advice started, and why it's so pervasive, but it's not necessary. The brinsea is supposed to mimic a momma hen. The temp under a momma hen stays the same, no matter how big the chicks are. They simply spend less and less time under the hen. The hen also doesn't get taller as the chicks get bigger, they just hunker down and creep under her.