Abstract: An LED filament bulb includes a driver and two filament sets. The driver includes a rectifier circuit, a filter circuit, a constant voltage (CV) circuit, a first constant current (CC) circuit and a second CC circuit. The rectifier circuit converts an AC power into a DC power. The filter circuit connects the rectifier circuit for filtering an AC component. The CV circuit connects the filter circuit for generating a fixed voltage and outputting the fixed voltage via a voltage output end. The voltage output end connects a first electrode of each filament set. The first CC circuit connects both the CV circuit and a second electrode of one of the filament sets. The second CC circuit connects both the CV circuit and a second electrode of another one of the filament sets. The CC circuits make currents flowing through the two filament sets identical.

Abstract: A LED light bulb simultaneously using as nightlight contains: a LED element, at least one LED filament, a base, a driving circuit, and a light guiding element. The base includes a hollow cavity for accommodating the driving circuit and LED element which electrically connects with the driving circuit, the base also includes an electrical fitting electrically connected with the driving circuit and a bulb holder. The light guiding element is made of photoconductive material and coupled with the base, and the light guiding element includes a light entering end corresponding to a light emitting end of the LED light to guide lights from the LED element. The at least one LED filament is electrically connected with the driving circuit and surrounds around the light guiding element, and the at least one LED filament is supported by the light guiding element to emit the lights.