A light bar is disclosed which includes a substrate, plural LEDs disposed on the substrate, a first connector and a second connector disposed on opposite sides of the substrate, a first wire, a second wire, a third wire, and a fourth wire. The first connector sequentially includes a first pin, a second pin, a third pin, and a fourth pin. The second connector sequential includes a fifth pin, a sixth pin, a seventh pin, and an eighth pin. The first wire connects the first pin to the second pin. The second wire connects the third pin to the fifth pin. The third wire connects the sixth pin to the seventh pin. The fourth wire connects the fourth pin to the eighth pin. A light emitting module using the light bar is also disclosed.