For most brooder sizes a 250w heat lamp is far too much. Save on electricity and use a 100w or even 75w incandescent.
My tote is typical brooder size for small number of chicks, about 2X3 ft and 100 watts in metal reflective hood is more than enough heat.
I used a 250w because I keep them in the garage, its not uncommon for lows to hit single digits even in march/early april out there. If youre raising them in the summer or a southern state or indoors, I would definitely opt for something that doesn't spin your meter as fast.