Do you mean two heat lamps? Unless you are brooding a hundred chicks, you would never need two heat lamps!
The entire objective in brooding chicks is to create two temperature zones, a warm zone and a cool zone. so they are then able to self regulate their body temps. You never want to heat the entire brooder.
Just imagine yourself in a big crowd, tightly packed around a bonfire. You would very quickly overheat if the crowd was so dense as to prevent you from moving away from the fire. In fact, you could get heat sick and die. That's precisely what happens to baby chicks in a brooder that's too small and heated with too many lamps as to prevent any cool spaces in which chicks can cool down after absorbing a bit too much heat.
Also, a 250 watt heat bulb for just a hand full of chicks is often overkill. A 100 watt incandescent bulb would be plenty in most cases. But, many of us have ditched the old fashioned and dangerous heat lamps and are now brooding under the much safer and more natural heating pad system. See "Mama Heating Pad for the Brooder thread, and read my article on brooding outdoors for healthier chicks. It's linked below under "Articles by Azygous".