A folded light engine comprising an array of LEDs mounted on a strip substrate, wherein the strip substrate comprises a central portion and first and second peripheral portions (20a, 20c) of substantially equal width and extending in parallel in the longitudinal direction of the strip substrate, the central portion being provided with a first set of through-holes (22, 22'), the first peripheral portion being provided with at least one electrically conducting track (25a, 25b), connecting a first group of LEDs (24a, 24b) mounted on the first peripheral portion, each LED (24a, 24b) in the first group being aligned with a through-hole in the central portion, the first peripheral portion further being provided with a second set of through holes, each through-hole in the second set being aligned with a through-hole in the first set, the second peripheral portion being provided with at least one electrically conducting track, connecting a second group of LEDs mounted on the second peripheral portion, each LED in the second group being aligned with a through-hole in the first set and with a through-hole in the second set, wherein the first peripheral portion has been folded over the central portion, so that the LEDs mounted on the first peripheral portion coincide with through-holes in the central portion, and through-holes in the first peripheral portion coincide with corresponding through-holes in the central portion, and wherein the second peripheral portion has been folded over the first peripheral portion, so that LEDs mounted on the second peripheral portion coincide with a combined through-hole formed by a through-hole in the central portion and a through-hole in the first peripheral portion. the strip substrate comprises a central portion and first and second peripheral portions (20a, 20c) of substantially equal width and extending in parallel in the longitudinal direction of the strip substrate, the central portion being provided with a first set of through-holes (22, 22'), the first peripheral portion being provided with at least one electrically conducting track (25a, 25b), connecting a first group of LEDs (24a, 24b) mounted on the first peripheral portion, each LED (24a, 24b) in the first group being aligned with a through-hole in the central portion, the first peripheral portion further being provided with a second set of through holes, each through-hole in the second set being aligned with a through-hole in the first set, the second peripheral portion being provided with at least one electrically conducting track, connecting a second group of LEDs mounted on the second peripheral portion, each LED in the second group being aligned with a through-hole in the first set and with a through-hole in the second set, wherein the first peripheral portion has been folded over the central portion, so that the LEDs mounted on the first peripheral portion coincide with through-holes in the central portion, and through-holes in the first peripheral portion coincide with corresponding through-holes in the central portion, and wherein the second peripheral portion has been folded over the first peripheral portion, so that LEDs mounted on the second peripheral portion coincide with a combined through-hole formed by a through-hole in the central portion and a through-hole in the first peripheral portion.