A method of lighting a surface having opposed ends, the method including arranging at said opposed ends of said surface a pair of lighting devices including a linear array of light radiation emitters, wherein: - a) the light radiation emitters in the array include: - an electrically-powered light radiation source, - a light guide member having a first end coupled with the light radiation source to receive a light radiation therefrom and a second end to emit light radiation guided by the light guide member along a guide axis, and - an optical system to receive light radiation from the light guide member and project outgoing light radiation from the lighting device, - b) the light guide members of the light radiation emitters in the array are arranged with their second ends aligned in a longitudinal direction (z) of the array and with their light guide axes lying in a common plane angled to a reference plane, - c) the optical systems of the light radiation emitters in the array are configured (S1,....., S8) for producing from light radiation input beams output beams in said outgoing light radiation with higher angles to said reference plane than said input beams, wherein the method includes: - arranging said pair of lighting devices with said array extending facing the surface with said reference plane arranged transversally of said surface and the lighting devices in the pair arranged symmetrical to each other and directing their light radiation towards each other, - configuring the optical system in said lighting devices to give rise to an illuminance distribution over the illuminated surface which decreases linearly from the region of the illuminated surface facing the lighting device. - a) the light radiation emitters in the array include: - an electrically-powered light radiation source, - a light guide member having a first end coupled with the light radiation source to receive a light radiation therefrom and a second end to emit light radiation guided by the light guide member along a guide axis, and - an optical system to receive light radiation from the light guide member and project outgoing light radiation from the lighting device, - an electrically-powered light radiation source, - a light guide member having a first end coupled with the light radiation source to receive a light radiation therefrom and a second end to emit light radiation guided by the light guide member along a guide axis, and - an optical system to receive light radiation from the light guide member and project outgoing light radiation from the lighting device, - b) the light guide members of the light radiation emitters in the array are arranged with their second ends aligned in a longitudinal direction (z) of the array and with their light guide axes lying in a common plane angled to a reference plane, - c) the optical systems of the light radiation emitters in the array are configured (S1,....., S8) for producing from light radiation input beams output beams in said outgoing light radiation with higher angles to said reference plane than said input beams, - arranging said pair of lighting devices with said array extending facing the surface with said reference plane arranged transversally of said surface and the lighting devices in the pair arranged symmetrical to each other and directing their light radiation towards each other, - configuring the optical system in said lighting devices to give rise to an illuminance distribution over the illuminated surface which decreases linearly from the region of the illuminated surface facing the lighting device.