View This Issue - August 2010

Active PFC driver design enables dimmable retrofit lamps (MAGAZINE)

Halogen and incandescent lamps, although popular, present some key concerns in today’s power conscious, green world. The lamps consume a lot of power and typically burn out after a few thousand hours of use. The latest high brightness LEDs (HB-LEDs) offer a great alternative – they use a lot less power and can last about ten times as long. However, designing LED-based solid-state lighting (SSL) replacements for popular halogen and incandescent lamps such as the MR16, PAR20, A19, and others presents several design challenges. The retrofit lamps must work with legacy triac dimmers and the driver electronics must fit in a tight space. But new driver designs with active PFC stages are enabling reliable and dimmable SSL retrofit lamps.

The primary challenges of designing an LED retrofit lamp include:

  • The retrofit lamps must fit in the same socket as the lamp they replace, and that means they should have the same form factor;
  • They have to manage the high amount of power generated by the LEDs, by having proper heat sinking, but also by working at high temperature while keeping high reliability and long lifetime;
  • They must be electrically compatible with the existing lighting infrastructure (wiring, dimmers, etc.).


This article was published in the July/August 2010 issue of LEDs Magazine. To read the full version of this article, please visit our magazine page, where you can download FREE electronic PDF versions of all issues of LEDs Magazine. You can also request a print copy of LEDs Magazine (available by paid subscription) and sign up for our free weekly email newsletter.


Guardian Industries

Guardian Industries Corp. is a leader in float glass, fabricated glass and high performance coated glass products. Guardian lighting solutions deliver optimal performance, flexibility and...


LTF, LLC is a U.S based solid-state lighting product development and manufacturing company with facilities located in both USA and China.

Illumination Machines

Illumination Machines designs custom optics, heat sinks, and remote phosphor systems for LED luminaires and lamps.


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High-density pixel pitch,high resolution,high refresh rate,magnificent and high-definition image and video effect.P3,P5,P6,P7.62 to P10 available.Epistar SMD LED,wide viewing angle.High r...

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Beam angle adjustable 10-60 degree.Shell can rotate 360°,vertical 0-40°.High power CREE LED,even and uniform light output,Die casting aluminum alloy housing,good heat sinking.Widely used ...

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