Consider the dimensions of your hallway when sizing recessed lights. Placing smaller fixtures in a longer hallway can create dark corners, depending on placement and bulb type. Recessed lights should fill the space with a warm glow. Consider what other type of lighting you have as well. If there is light coming from a hanging chandelier or spilling in from a nearby living room, you may need only fill lighting in certain spots, such as a few small recessed fixtures in the far corners. Hallways with higher ceilings do best with larger fixtures spaced out several feet apart. For instance, 8-foot-tall ceilings need fixtures about 3 feet apart, while 10-foot ceilings require spacing of about 5 feet.
The type of hallway and its location also affect which size recessed light is best for the space. A tiny nook hallway may do very well with one or two small recessed lights or one medium-size light in the center. If a coat closet is located in the hallway, a medium light may be desired. A foyer hallway does well with medium or larger fixtures that fill the area with soft light to create a welcoming feel.
The number of lights you'd like to place in your hallway directly affects what size fixture you need. A larger number of tiny recessed fixtures can highlight the hallway's length if you place them along each wall. Oversize fixtures can create a slightly dramatic effect, especially if you have a high or slanted ceiling, but you will need fewer of them.
Recessed lights that are appropriately sized can highlight eye-catching artwork or wall hangings. Each light can be placed above or even below a piece, and it should be large enough to wash the piece in light without any dark shadows. Place smaller hangings or works along the length of the hallway, along with smaller lighting fixtures, with a large, central piece and fixture at the end to fill and balance an especially long, narrow hallway. If you have an interesting archway, staircase or other architectural piece of interest at the end of the hall, larger recessed fixtures can highlight it as well.