Sorry, in my haste to explain why I added confusion.
Just because it says dimmable on the package does not mean it is dimmable by conventional dimmers or methods. Some are targeted at trailing edge, some leading edge, some lower the voltage, some require you buy their proprietary dimmer, and so on. The reasons are in my earlier post. To create a good dimmer you will need to choose a specific bulb, understand how it does the conversion to voltages the LED can use, then choose a method compatible with that converter design.