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It’s hard to regulate a heat lamp by height alone. Should have brooder thermometer in brooder at all times at bird height near the heat lamp to measure temperature to see if you are high or low. I used a thermoregulator that had its own temp probe and plugged it into my heat lamp so it turned my heat lamp on and off for me to keep set temp. I weaned temp 5 degrees every 5-7 days depending on how much time my chics sat under the heat lamp. If happy walking around temp probably comfortable for them. You will notice they will go back and forth throughout day to gather heat from lamp and go to other side to cool off. They will do this likely throughout time in brooder. This is normal. If too hot they will pant and sit on furthest wall. I found the thermoregulator very helpful.