Great details and pics!
That should be ok for about a week or so, but they will outgrow it fast.
It will get crowded and they will be able to jump/fly out before too long.
Do you have a plan for larger enclosure?
Is your coop ready?
You can see they are sleeping away from right under the light,
but not at the very far end, so heat probably OK for now.
Put the thermometer on the other side of feeder and see what the temp is there,
it should be at least 10F cooler.
What was the temp on the therm at the time of the pic being taken?
Is the lamp shade touching the plastic?
Can you put and leave your hand on the lamp shade near the bin for more than a minute?
Can you raise the lamp shade to lower the temp on the brooder floor and to get it away from the bin edge?
I would suggest a smaller bulb(see above) with a dimmer cord and a metal wire mesh cover on the bin.
You can take the big loopy guard off and set the lamp shade right on the mesh.
I was using regular incandescent bulbs(100W) in this pic(
my first brooder), before I switched to red reptile bulbs before I switched to a heating pad. If you use a regular incandescent bulb
make sure it is NOT a 'safety coated' bulb, the coating fumes can kill them quick.
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