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@imran, yes there is bridge rectifier used in led bulbs with capacitors as dc purifiers. Voltage is step downed by using magnetic core high frequency transformers. ac current is being rectified partially via bridge rectifier and small ac pulsating in dc current is filtered by capacitor. Use of some resistance allows to slow down the flow of current and feed the LEDs their needed one approx. 0.02micro amps. In many lamps instead using X’mers they divide voltage by connecting LEDS in series. In this way LED lamp work.
I wish if Er. Kiran can check my comment and do clear my dobts if any.