LED filament

An LED light bulb, comprising:

• a bulb shell;
• a bulb base connected to the bulb shell;
• a stem comprising a stem bottom and a stem top opposite to each other, the stem bottom being connected to the bulb base;
• at least two conductive supports connected to the stem;
• an LED filament comprising a filament body and two conductive electrodes, the two conductive electrodes being at two opposite ends of the filament body and being respectively connected to the two conductive supports, the filament body being around the stem;
• and
• at least one supporting arm with an end connected to the stem and an another end connected to the filament body;
• wherein, when the LED light bulb is projected to a side projection plane parallel with a height direction of the LED light bulb, a filament side projection of the filament body on the side projection plane comprises a highest point and a lowest point, a height difference is defined between the highest point and the lowest point in the height direction, the height difference is from 1/8 to 3/8 of a height of the bulb shell;
• wherein, when the LED light bulb is projected to a horizontal projection plane perpendicular to the height direction of the LED light bulb, a filament horizontal projection of the filament body on the horizontal projection plane is of a quasi-circle or a quasi U shape, and a shortest distance between the two ends of the filament horizontal projection is from 0 cm to 3 cm;
• wherein, in the height direction of the LED light bulb, a height difference between the two conductive electrodes is from 0 mm to 5 mm.

An LED light bulb, comprising:

• a bulb shell;
• a bulb base connected to the bulb shell;
• a stem comprising a stem bottom and a stem top opposite to each other, the stem bottom being connected to the bulb base;
• at least two conductive supports connected to the stem;
• a single LED filament comprising a filament body and two conductive electrodes, the two conductive electrodes being at two opposite ends of the filament body and being respectively connected to the two conductive supports, the filament body being around the stem;
• and
• at least one supporting arm with an end connected to the stem and an another end connected to the filament body;
• wherein, the filament body comprises at least one first curving segment and at least two second curving segments, the first curving segment is between the two second curving segments, the two conductive electrodes are respectively at an end of each of the two second curving segments away from the first curving segment, a height difference between the two conductive electrodes in a height direction of the LED light bulb is from 0 mm to 5 mm, the first curving segment curves towards a first direction, the second curving segment curves towards a second direction, and the first curving segment and the two second curving segments form a wave shaped annular structure.