A light device includes a hollow light transmissive tube, a first light bar, a second light bar, and two rotatable end cap structures. The hollow light transmissive tube has a first end portion and a second end portion. The first and second light bars are accommodated in the hollow light transmissive tube. The two rotatable end cap structures are sleeved on the first and second end portions. Each of the two rotatable end cap structures includes a first light bar rotation assembly and a second light bar rotation assembly. The first light bar rotation assembly is connected to an end of the first light bar. The second light bar rotation assembly is connected to an end of the second light bar. The illumination angle of the first light bar can be adjusted by rotating the first light bar rotation assembly, and the illumination angle of the second light bar can be adjusted by rotating the second light bar rotation assembly.
