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 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 , the first peripheral portion being provided with at least one electrically conducting track , connecting a first group of LEDs mounted on the first peripheral portion, each LED 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 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 , the first peripheral portion being provided with at least one electrically conducting track , connecting a first group of LEDs mounted on the first peripheral portion, each LED 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. <EOS>