Modular lighting systems comprised of a light source and interchangeable accessories sold as a unit therewith for use in creating a flashlight, bicycle light, electric lantern, head lamp, light poles being stands for electric lighting fixtures, articulating arm with electric lighting fixtures, articulating electric task lighting fixtures, desk light, or electric lighting fixtures featuring clamps for use while tailgating; portable light sources, namely, portable utility lights and portable battery-operated lights that can be placed on surfaces where other light sources are unavailable; lighting systems using LED technology comprised of a light source and interchangeable accessories sold as a unit therewith for use in creating a flashlight, bicycle light, electric lantern, head lamp, light poles being stands for electric lighting fixtures, articulating arm with electric lighting fixtures, articulating electric task lighting fixtures, desk light, or electric lighting fixtures featuring clamps for use while tailgating; lighting systems using LED technology comprised of LED modules, power supplies, and wiring; portable luminaires using light emitting diodes (LEDs) as a light source; portable lighting system comprised of a light source and interchangeable accessories sold as a unit therewith for use in creating a flashlight, bicycle light, electric lantern, head lamp, light poles being stands for electric lighting fixtures, articulating arm withelectric lighting fixtures, articulating electric task lighting fixtures, desk light, or electric lighting fixtures featuring clamps for use while tailgating