What's the difference between 4-inch and 6-inch potlights and which should I choose?

The main difference is the spread of light and the visual impact on your ceiling — 4-inch potlights produce a tighter, more focused beam while 6-inch potlights cast a wider, more general wash of light across the room. For most GTA homes, a mix of both sizes often produces the best result, but if you're choosing one size for consistency, 4-inch slim LED panels have become the dominant choice in Toronto renovations over the past few years.

Four-inch potlights work exceptionally well in spaces with standard 8-foot ceilings, which describes the vast majority of main-floor and upper-level rooms in post-war Scarborough bungalows, North York split-levels, and suburban homes across Mississauga, Brampton, and Markham. The smaller diameter looks proportional on an 8-foot ceiling without overwhelming the space, and modern 4-inch LED panels put out 700 to 900 lumens — more than enough for general room lighting when properly spaced. A typical 12-by-12-foot room needs four to six 4-inch potlights for even coverage.

Six-inch potlights make more sense in rooms with 9-foot or higher ceilings, open-concept living areas, and basements where you want maximum light output from fewer fixtures. They typically produce 900 to 1,200 lumens per unit, so you need fewer of them to light the same area. In a large open-concept main floor — common in newer Vaughan and Richmond Hill builds — 6-inch lights spaced 6 to 8 feet apart create a clean, evenly lit space without the ceiling looking cluttered.

Slim LED panels versus traditional housings is the more important decision in 2026. Traditional potlight housings require 5 to 7 inches of clearance above the ceiling, which creates problems in spaces with shallow joist cavities, HVAC ductwork, or limited attic space. Slim LED panels are only about an inch thick and mount directly to the drywall with a junction box off to the side, making them installable in virtually any ceiling. They also carry IC ratings for direct insulation contact, eliminating the fire-safety spacing requirements that older halogen housings demanded.

For colour temperature, most GTA homeowners choose 3000K (warm white) for living areas and bedrooms and 4000K (neutral white) for kitchens and bathrooms. Many modern LED potlights are CCT-selectable, letting you switch between colour temperatures with a toggle on the fixture before installation. Your electrician can advise on spacing and beam angle based on your specific room dimensions and ceiling height. Browse electricians in the Toronto Construction Network directory to find someone who can walk you through the options for your home.