Because of the price. However, the original set is sufficient only for a 80 cm tree (or 1 meter ....- :))). However, the use is then the easier / more comfortable. It works and the lights are about as wired. However, if you previously had the right wax tree, should turn stronger, wired, because the light illuminates the room, of course not! For us enough and with a fireplace to make excellent alternative to the room homey! Batteries held the "Christmas season" by and there was no change required (light intensity has remained at approximately the same) Recommended!