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  • Airport Lighting
  • Aviation Obstruction Lighting
  • H&P Hughey Phillips Obstruction Lighting
  • Emergency Vehicle Warning Lights, Lamps & Bulbs
  • Fluorescent Light Bulbs
  • Halogen Light Bulbs
  • Heliport Lighting
  • Incandescent Light Bulbs
  • LED Replacement Light Bulbs
  • Photography Lighting
  • HID (High Intensity Discharge) Light Bulbs
  • Specialty Lighting & Light Bulbs
  • UV Ultra Violet, UV-C Germicidal Lamps
  • Industrial Flashlamps
  • Clearance and Closeouts - Full Lots of Bulbs
  • Westinghouse Light Bulbs

    • Shop by Brand

  • EiKO
  • USHIO AMERICA
  • SYLVANIA LEDVANCE
  • Westinghouse Lighting
  • HUGHEY & PHILLIPS
  • GENESIS LAMP
  • TWR
  • WHELEN
  • SANYO
  • ECCO
  • View all Brands

    • U Shaped Fluorescent Light Bulbs

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    U Shaped Fluorescent Light Bulbs

    The most common form of fluorescent lamp is a tube with two pins on each end. The diameter of the tube is described in eighths of an inch, as it is for incandescent lamps, so a fluorescent lamp 1½ inches in diameter is a T-12. The 2-pin bases (called bi-pin bases) come in several sizes, but by far the most common in homes is the medium bi-pin.