Luminaire that is straight and extends in the longitudinal direction, for a light band, - wherein the luminaire has an elongate U-shaped support profile and an elongate U-shaped device carrier that is secured to the support profile in a form-fitting manner, - wherein the device carrier closes the support profile perpendicular to the longitudinal direction at least in some regions with a profile closing base, and thereby a profile interior is formed in the support profile, - wherein the luminaire has at least one elongate optical cover, which is secured to the device carrier, - wherein the at least one optical cover closes the device carrier perpendicular to the longitudinal direction, and thereby a support interior is formed in the device carrier, - wherein the luminaire has at least one elongate light support plate with a plurality of light sources, wherein the light support plate is secured in the support interior of the device carrier, - wherein the luminaire has at least two elongate V-shaped retaining clips each comprising a first support blade and a second support blade, which are connected together via a support edge, characterised in - that the respective retaining clip is supported in the support interior by means of the first support blade on the light support plate, by means of the second support blade on the at least one optical cover and by means of the support edge on an elongate support contour of the device carrier, and - in that the light support plate and the at least one optical cover are secured in the support interior towards the support profile on the device carrier and thereby the holding action of the retaining clip can be enhanced by the weight of the light support plate and by the weight of the optical cover. - wherein the luminaire has an elongate U-shaped support profile and an elongate U-shaped device carrier that is secured to the support profile in a form-fitting manner, - wherein the device carrier closes the support profile perpendicular to the longitudinal direction at least in some regions with a profile closing base, and thereby a profile interior is formed in the support profile, - wherein the luminaire has at least one elongate optical cover, which is secured to the device carrier, - wherein the at least one optical cover closes the device carrier perpendicular to the longitudinal direction, and thereby a support interior is formed in the device carrier, - wherein the luminaire has at least one elongate light support plate with a plurality of light sources, wherein the light support plate is secured in the support interior of the device carrier, - wherein the luminaire has at least two elongate V-shaped retaining clips each comprising a first support blade and a second support blade, which are connected together via a support edge, - that the respective retaining clip is supported in the support interior by means of the first support blade on the light support plate, by means of the second support blade on the at least one optical cover and by means of the support edge on an elongate support contour of the device carrier, and - in that the light support plate and the at least one optical cover are secured in the support interior towards the support profile on the device carrier and thereby the holding action of the retaining clip can be enhanced by the weight of the light support plate and by the weight of the optical cover.