Why aren't many / most LED light bulbs dimmable?

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is a rectifier, but it is only a 1/2 wave rectifier. Adding a full wave rectifier, as others (and me too) have done, makes the string brighter and eliminates much of the annoying blinking. Yes it still blinks, but full wave rectification makes it a whole lot better.
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The manufacturers could put an anti-parallel LED in the same package with the same effect. The power dissipation is the same (application dependent) so the package wouldn't need to be changed, just another junction on the same die.
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responding to http://www.homeownershub.com/maintenance/Why-aren-t-many-most-LED-light-bulbs-dimmable-610930-.htm DA wrote:
Home Guy wrote:

Unlike CFLs, LEDs are *ALL* dimmable. You just have to have the right dimmer. Since all lightbulb types require their own dimming technique, it's a challenge to design one dimmer that would work for any type of lightbulb a consumer can buy. Some are trying though, Lutron for example. Check out these "C-L" dimmers they sell that are for both *dimmable* CFLs and LEDs:
http://www.lutron.com/Education-Training/LCE/Pages/DimmingCFLsandLEDs.aspx
Note that they are not intended for incandescent or halogen bulbs whereas bulk of the dimmers in HD or Lowes today are the other way around.
I'm guessing if LED lighting is ever to prevail, there will be an abundance of dimmers using PWM (Pulse-width modulation) that will work with any LED lightbulbs, even the crude and unreliable ones you can buy today. It's just the need to work with any lightbulb you can throw at them that's holding the dimmer manufacturers back.
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