Unlike pendant or batten light fittings, recessed lights are installed directly inside a ceiling or wall. They are typically hard to detect unless on, and usually come in a row. These light fixtures comprise three parts: the housing, trim and bulb. The housing is what sits inside your ceiling or wall and isn’t visible on the outside. The trim and the bulb are visible, and can vary in shape and appearance. Recessed lights are commonly used in bathrooms, hallways and kitchens, or in modern living and dining rooms.