Brooder help

[Chicken teen618]

So I set up my brooder and I’m still not sure how high I should set up my heat lamp, does anyone have any advice?

 

[3KillerBs]

I hung mine on a chain and used a combination of raising and lowering it on said chain AND swapping out different wattages of bulbs to keep the temperatures where I wanted them to be.

For safety's sake I kept the bulb at least 15" from anything potentially flammable:

The lamp is further from the wall than it looks in this photo:

This brooder is 4x8:

A thermometer on a brick gives me a reasonable idea of what the chick-level temperature is: