The most popular so-called "large screw thread." Most often used in pendant lamps, wall lamps (sconces), or lamps with large shades for bedrooms or living rooms. Available in many variants of wattage, color temperature, and diffuser color.
The so-called "small screw thread." They are used in decorative lamps, smaller wall lamps (sconces), e.g., in hallways or next to a bathroom mirror. Available in many variants of wattage and light color.
Most commonly found in recessed spotlights, track lighting, and directional "spot" fixtures, typically installed in hallways, kitchens, or living rooms. Available in many variants of wattage and light color.
Ready-to-use LED modules, installed in compatible surface-mounted fixtures, e.g., ZALDA. They are suitable for use in kitchen or dining room lamps, as well as in shop displays and showcases. Available in several wattage variants.