I did a heat lamp for my first batch of chicks. Never again. I was up all night as with a new born baby, checking the temp and making sure everything is fine.
I bought a little heat plate that they could get under on the next batches. So much better and I never had to worry about them at night. They would go under when they were cold and out when they were too warm.
Yep, already mentioned: "... use a thermometer to monitor the temperature in the brooder. You may need to adjust the height of the lamp to maintain the correct temperature. The closer the lamp is to the chicks, the warmer they will be, and vice versa."