What Size Is a Standard Can Light

Recessed lights are categorized by their size. The most common residential sizes are 4-inch, 5-inch and 6-inch.

How do I know what size can light I have?

To determine the size, measure the diameter of the cut-out opening in inches, not including the trim. Choose one that will accommodate the height of your ceiling or the size of your wall. 4-inch and 5-inch fixtures are great in kitchens for providing overhead countertop lighting.

How big is the hole for a can light?

Another common recessed can light manufacturer is Juno and for their can lights one needs cutout holes of 3-1/4″, 4-3/8″, 5-1/2″ 6-3/4″, 6-7/8″. And this is just for the residential high hats or recessed ceiling lights. Commercial can lights can require cutout holes larger than 8 inches in diameter.