Lighting fixtures and retrofit kits hard wire into an electrical system to supply indoor lighting. Fixtures for general area lighting include panels and troffers for grid ceilings, surface-mount fixtures for drywall surfaces, and bay lights for high ceilings or open trusses. Fixtures for smaller areas and more upscale lighting include can, track, decorative, and cove lights. Other fixtures provide light for specific settings (hazardous locations, damp locations, high-abuse areas, or healthcare) or specific applications (disinfection or plant growth). Retrofit kits convert existing fixtures to LED or more energy-efficient, fluorescent bulbs without having to switch out the entire fixture.