The STAR SKY ceiling, with a starry sky effect can be applied directly to fir paneling, on the constructive structure of the sauna. There is no danger on mounteing it on wood, because the optic fiber generates only the light, not the heat or the electricity. Dependin on the thickness of the fiber, the bright dots may have different sizes, and lower or higher brightness. The bright spots of the STAR SKY ceiling of the sauna can be regularly arranged or they can imitat constellations. The dynamic of the brightness and the color (fixed or vibrating ) it will be defined by the constructive model of the projector, the projector beeing the source of light for the starry sky ceiling. The optical fiber used in these cases is protected by an outer layer of protection, applied over the fibers. Usually we use ties which unfold and apply, then we remove the protective tube only in the areas where the light will produce effect. If you want we have available insertable spots made out of optical fibers.