The predefined sets for the starry sky ceiling, consist the projectors and the pre-cut optic fiber. The sets can have length of 2m, 3m, 4m, 5m, or 6m and the connection wires ca be placed from 100 to 1,200 of threads. You should take in consideration the high perisaj in cases of predefined sets of starry sky ceilings. ( example : if we have a bundle of 100 wires to 2ml, the hole of the projecfor beeing of 10cm, we lose 1.8ml of optic fiber). Please read carefully the description of the projector, the halogen bulb, the light source , with led or rgb beeing different.