4-pin base spiral CFL lamps are designed for use with external ballasts in commercial and institutional fixtures. Unlike self-ballasted screw-in CFLs, these lamps rely on a hardwired CFL ballast inside the luminaire for ignition and regulation. Common bases include GX24q-1 through GX24q-4 (quad-pin) and 2GX13, covering wattages from 18W to 55W. This design is standard in dedicated commercial downlights, wall sconces, and architectural fixtures specified for institutional or hospitality projects.
The ballast-driven configuration offers tighter control over lamp operating parameters, often yielding better lumen maintenance over lamp life and compatibility with occupancy sensor or time-clock controls compared to integrated-ballast models. Always verify that the replacement lamp matches the existing ballast's lamp type, pin base, and wattage rating before ordering in bulk.
For non-ballasted applications in the same spiral format, see our Medium Base Spiral CFL Lamps. The full Spiral CFL Lamps section covers all base types in stock. Facilities transitioning to LED can explore LED Light Bulbs for longer-term lamp replacement programs with reduced maintenance overhead.
Featured$2.62SKU: OD-ODT32W/4P-27KBRAND: Overdrive Lighting
