Method for photometrically measuring a light source (Q, 3) clamped into a positioning device, which comprises an object coordinate system, by means of a luminance measurement camera arranged fixedly relative to a world coordinate system, wherein the light source (Q, 3) is moved between a first current measurement position (P1') and at least one further current measurement position (P2' to P5') along a kinematic chain of the positioning device in the world coordinate system, wherein, with the light source (Q, 3) switched on, a luminance measurement image (81 to 85) is recorded at each current measurement position (P1' to P5') by means of the luminance measurement camera, the image describing the spatial distribution of a photometric characteristic in a measurement area, wherein the location and/or the orientation of the object coordinate system relative to the world coordinate system is captured at each current measurement position (P1' to P5') in direct relationship with the world coordinate system without reference to the kinematic chain of the positioning device with a capturing tolerance which, in terms of at least one parameter, is smaller than the assured positioning tolerance of the positioning device, wherein the capturing tolerance indicates the maximum deviation of the actual location and/or orientation of the object coordinate system from the captured location and/or orientation of the object coordinate system relative to the world coordinate system, and wherein the assured positioning tolerance is determined as the maximum deviation of a current measurement position (P1' to P5') that is actually approached from a specified target measurement position (P1 to P5), and wherein a necessary positioning tolerance of the positioning device is ascertained and a positioning device having a positioning tolerance which is smaller than or preferably identical to the ascertained necessary positioning tolerance is selected, wherein the necessary positioning tolerance is ascertained such that a sequence of target measurement positions (P1 to P5) can be arranged and approached such that complete capturing of the photometric characteristic in the measurement area is possible with the assigned sequence of actually reached current measurement positions (P1' to P5') located in each case within the positioning tolerance around a target measurement position (P1 to P5). wherein, with the light source (Q, 3) switched on, a luminance measurement image (81 to 85) is recorded at each current measurement position (P1' to P5') by means of the luminance measurement camera, the image describing the spatial distribution of a photometric characteristic in a measurement area, wherein the location and/or the orientation of the object coordinate system relative to the world coordinate system is captured at each current measurement position (P1' to P5') in direct relationship with the world coordinate system without reference to the kinematic chain of the positioning device with a capturing tolerance which, in terms of at least one parameter, is smaller than the assured positioning tolerance of the positioning device, wherein the capturing tolerance indicates the maximum deviation of the actual location and/or orientation of the object coordinate system from the captured location and/or orientation of the object coordinate system relative to the world coordinate system, and wherein the assured positioning tolerance is determined as the maximum deviation of a current measurement position (P1' to P5') that is actually approached from a specified target measurement position (P1 to P5), and wherein a necessary positioning tolerance of the positioning device is ascertained and a positioning device having a positioning tolerance which is smaller than or preferably identical to the ascertained necessary positioning tolerance is selected, wherein the necessary positioning tolerance is ascertained such that a sequence of target measurement positions (P1 to P5) can be arranged and approached such that complete capturing of the photometric characteristic in the measurement area is possible with the assigned sequence of actually reached current measurement positions (P1' to P5') located in each case within the positioning tolerance around a target measurement position (P1 to P5).