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The LED Authority

TCP 40 Watt Screw-in Circline Ballast

SKU: TEC17040 | Ordering Code: 17040 (40W Screw-in Ballast)  | UPC: 762148170419

$9.99 $8.49 per Ballast
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Clearance ItemOnly 35 left in stock. Will not be re-stocked. Typically ships within one business day.

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Product Highlights

  • Ignites one CFL lamp

TCP 40 Watt Circline Fluorescent Lamp REPLACEMENT Ballast* with Medium Screw Base. (diameter 2 3/4", length 3.75") BALLAST ONLY, LAMP NOT INCLUDED.

Full Specs



Model Number


Number of Lamps


Ballast Type

Magnetic ballasts are a legacy technology and use inductance to transform the line voltage to the voltage required to "fire" or excite the gasses in a lamp. Electronic ballasts use a variety of starting methods, and are more efficient than magnetic ballasts in converting input power to the proper lamp power and operate fluorescent lamps at higher frequencies, resulting in an overall lamp-ballast system – increasing efficacy 15% to 20% over a magnetic equivalent.
Ballast Type

Ballast Lamp Type

The type of bulb the ballast can fire.
Ballast Lamp Type

Start Type

For Ballasts, indicates the method the ballast uses to start its bulbs. HID ballasts can be Probe or Pulse start. Fluorescent ballasts can be Rapid, Instant or Programmed start. For HID and Fluorescent bulbs, indicates the start-type of ballast that the bulb will work with.
Start Type
Modified Rapid Start
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