A lighting device, or LED lamp 10 is described with a base element 12 for electrical contacting and mechanical mounting and an LED arrangement 20 with at least one LED element 70. The LED arrangement 20 is spaced from the base element 12 along a longitudinal axis L. In order to provide a lighting device and a lighting arrangement with a matched optical and thermal design, i. e. where both effective heat dissipation and an advantageous light intensity distribution are achieved, an upper heat dissipating structure 60 is arranged next to the LED arrangement 20 with at least one heat dissipation element 62 made out of a heat conducting material. The upper heat dissipating structure 60 is shaped to include at least a first end 64a and a second end 64b spaced from the first end 64a along a traverse axis T. The traverse axis T is substantially perpendicular to the longitudinal axis L. The LED arrangement 20 is arranged between the first and second ends 64a, 64b.