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First off, some background- led chips are solid state devices that emit light ( and heat out the back) when driven with a DC voltage across a junction . As long as the voltage is within a range the led will emit light. To high and the led will be destroyed, too low and you get no light.
There is no difference in the LED chip between dimming and non dimmable.
BUT, there is a difference in how the chips might be circuited together and in the necessary control gear that is required to drive the led chip ( think a fluorescent lamp and its ballast, or a low voltage halogen lamp and its step down transformer). This equipment that drives the LED can have many different configurations,- direct DC, ( like an A cell battery) AC to DC conversion ( like the power brick that powers your laptop) and a host of others. These are the components that effect whether the LED can be dimmed. Plus there are lots different dimmers out there. With simple incandescent sources and their Transformers you can have triacs, forward phase dimming, reverse phase dimming and that's before you get into two wire, 0-10V dimming and digital dimming with other light sources.
Example- If you have a driver that senses incoming voltage and is designed to maintain a steady voltage to the rest of the electronic components in the driver, using a simple dimmer that varies the voltage will produce erratic control- since the driver is compensating for the loss in voltage at the start of dimming, and at the end dimming might have some leakage current that causes the LED to glow and " flash". No what you would consider a nice dimming curve.
So the short answers is no difference in the actual chip, but the driver will determine if the complete system can be dimmed.
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