An embodiment of the present invention discloses a LED lamp as well as a X-Ray device and a collimator comprising the LED lamp. The LED lamp comprises a single LED chip serving as the light-emitting member of the LED lamp for emitting light beams； and a convex lens mounted in front of the LED chip for converging the light beams emitted from the LED chip. Embodiments of the invention can save power, reduce cost, and facilitate mass production and assembly.
