Downlighting

Downlighting is a lighting technique in which fixtures are installed in or under a ceiling to direct light downward toward a task, surface, or area. The light generally emits predominantly toward the lower plane with little upward light, reducing glare and spill compared with open overhead lighting. Common downlighting fixtures include recessed can lights (also called downlight cans), surface-mounted downlights, and some track or architectural fixtures designed to emit a focused downward beam.

Key design considerations include beam angle and trim to control distribution, lumen output, color temperature (measured in Kelvin, typically 2700–4000K for interiors), and color rendering index (CRI) for accurate color perception. Spacing between fixtures depends on ceiling height and beam spread to achieve even illumination. Downlights can be dimmed; using LEDs reduces energy use and allows longer life. Heat management is important; LED downlights produce less heat but require proper thermal design. Insulation and fire safety: use IC-rated housings and appropriate rated fixtures in direct contact with insulation; some jurisdictions require fire-rated ceilings.

Applications span residential kitchens and hallways, commercial offices, retail spaces, galleries, and hospitality. Downlighting can be used as general ambient light, task lighting, or as accent to highlight architectural features or artwork. When planning, designers often layer lighting: ambient overhead downlights supplemented by wall or desk lamps, track lighting, or accent lights to avoid harsh shadows and create visual interest.