You can plug your lamp in to a outlet wired to a dimmer switch. I hung my lamps on light weight chain with S hooks so I could adjust the height.
I then wired up a electrical box with two dimmer switches in it. I used extension cords coming out of the box that my lights plug in to. The male end of one of the cords, I used to plug in my dimmer box. A very handy set up.
My chicks will be two weeks old tomorrow, and, I have the two 250W heat lamps at about one fourth power. I started out with it about 100 under the lamps, 90 away from them. In no time, the chicks were avoiding the lamps, so, I turned them down gradually. It's 90 under the lamps and 80 away from them currently. The chicks seem fine with it, go wherever they want in the 48" square brooder box. Some sleep near or under the lamps, some away from them, so, I think they are happy.
I have read where after a couple of weeks, 24/7 light may stress the chicks, so, if you can maintain temperature without the lamps for the night, that would give them a break from the light. I have a ceramic heater in the room with them next to the brooder box. It keeps the room warm so I need less light intensity to maintain brooder temperature.
I don't know that I will go without lamps for a while as they really do not make much light at their current setting and there are dark corners for the chicks to go to.
I am a first timer, and all the books I have read and this forum allowed me to be very prepared and know what to expect.
Yes, the chicks are every bit of fun that people say, so funny and comical we just love sitting and watching them. At two weeks, they are loving testing their wings, so, I put a screen on the brooder and declared a no fly zone. So much fun.
j.