A LED filament includes LED chips, a first bracket and a second bracket. The LED chips are secured on the first bracket and/or the second bracket. The first bracket and the second bracket are made out of metal. Two ends of each of the LED chips are electrically connected with the first bracket and the second bracket, or the plurality of LED chips are divided into groups of serially connected LED chips. Two ends of each of the groups of serially connected LED chips are electrically connected with the first bracket and the second bracket.