For lockdown, the 3 days before hatching, the temp is reduced to 90 degrees. That should be the warmest, you aim for. I like to ensure that temp about 1.5 - 2 inches above the flooring, depending on the height of the chick. For that small of an area, you might consider smaller bulbs, or the ceramic ones. The chicks need to be able to move from a bit cooler area, back to the warmer area, as needed.