LEDs are low voltage devices - on the order of 3 V. Any LED bulb that runs off of 80-260 Volts has internal circuitry to convert to a lower voltage. Unfortunately, there is no standard method to do the conversion, which means there is no standard method to dim them. You might find the perfect method for your sample bulbs, but those of another manufacturer won't work at all with your circuit. Or won't dim properly, or overheat and catch fire. If your customer wants to dim specific models from specific vendors, you have a chance, otherwise you'll have to wait for a standard to emerge.