CFL twin-tube plug-in lamps have a single, U-shaped tube and are direct replacements for existing twin-tube CFLs with the same base type. They are commonly used in emergency lights, bulkheads, hall lights, office lights, and signs.

CFL double twin-tube plug-in lamps have two, U-shaped tubes and are direct replacements for existing double twin-tube CFLs with the same base type. They are commonly used in emergency lights, wall packs, bulkheads, hall lights, office lights, and signs.

CFL triple twin-tube plug-in lamps have three, U-shaped tubes and are direct replacements for existing triple twin-tube CFLs with the same base type. They are commonly used in emergency lights, wall packs, bulkheads, hall lights, office lights, and signs.

LED UL Type A plug-in lamps are plug-and-play to install into an existing fluorescent light fixture and operate from its ballast, so there's no need to rewire, add drivers, or modify electrical components. They allow a simple transition when upgrading from compact fluorescent (CFL) lamps to more energy efficient, longer lasting LEDs. For proper operation, installers must verify that these light bulbs are compatible with fixture ballasts.

LED UL Type B plug-in lamps bypass the ballast and operate directly from a building's AC power. Also known as line-voltage lamps, they avoid the problem of faulty ballasts and drivers as well as the hassle and expense of adding drivers when upgrading from compact fluorescent (CFL) lamps to more energy efficient, longer lasting LEDs. These ballast-bypass light bulbs require wiring into mains electricity, so they are not recommended for installations that frequently experience power surges or interruptions.

LED UL Type A/B plug-in lamps are hybrid to operate from an existing fluorescent light fixture's ballast or from a building's AC power. They run from the ballast until it fails, then rewire directly to mains electricity. This eliminates the need to replace the fixture when the ballast burns out, and it spreads the cost of retrofitting over time when upgrading from compact fluorescent (CFL) lamps to more energy efficient, longer lasting LEDs. These hybrid light bulbs are used in installations that allow access for rewiring. For proper operation, installers must verify that these light bulbs are compatible with fixture ballasts.