Chick lighting

[Chickening101]

Hi, guys! I'm getting chicks soon!
According to what I've been reading, you turn the tempeture down five degrees every day when they're chicks. I know you need a thermometer, but how do you alter the tempeture?

 

[Pork Pie]

One simply increases the distance between heat source and chicks.

 

[Chickening101]

Oh! Thank you!