4-Pin Plug (Electronic)

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4-pin plug-in CFLs are designed for fixtures with electronic ballasts, offering improved efficiency, instant start, and — in many cases — dimming capability compared to 2-pin magnetic versions. The 4-pin configuration means the ballast controls all lamp functions externally, with no integrated starter in the lamp.

How to Identify 4-Pin Versions by Brand

Each manufacturer adds a suffix to their standard product line name to indicate the 4-pin electronic ballast version:

  • Philips (Signify): Adds "/4P" — e.g., PL-C becomes PL-C/4P, PL-T becomes PL-T/4P
  • GE: Adds "/E" — e.g., Biax D becomes Biax D/E, Biax T becomes Biax T/E
  • Sylvania (Ledvance): Adds "/E" — e.g., Dulux D becomes Dulux D/E, Dulux T becomes Dulux T/E

The "/4P" or "/E" suffix is critical — a 4-pin lamp will not operate correctly in a magnetic ballast fixture, and vice versa. Always verify whether your fixture has an electronic or magnetic ballast before ordering.

Common 4-Pin Base Types

  • G24q: Double tube 4-pin (variants G24q-1, G24q-2, G24q-3 by wattage)
  • GX24q: Triple tube 4-pin (variants GX24q-2, GX24q-3, GX24q-4 by wattage)
  • 2G11: Long twin (PLL) 4-pin

These lamps are the standard for modern commercial downlights, troffers, and wall-wash fixtures. Dimmable performance depends on the ballast — the lamp itself is dimmable when paired with a compatible dimmable electronic ballast.

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