A lighting system includes a plurality of light sources; an elongated luminescent body defining a length (L) and a height or diameter (H), and having a light input face, a light output face, and at least one side face bridging the height or diameter (H); a garnet type A3B5O12 luminescent material including trivalent cerium, provided in the elongated luminescent body with a height dependent concentration range defined by a minimum concentration ymin=0.036*x−1 and a maximum concentration ymax=0.17*x−1, where y is the trivalent cerium concentration in % relative to the A element, and x is the height (H) in mm; at least one heat transfer elements in thermal contact with the elongated luminescent body; and a reflector provided opposite the light sources on the elongated luminescent body. The garnet type A3B5O12 luminescent material converts at least part of light from the light sources into converted light.
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