In SPA centers, swimming pools the STAR SKY  and the starry sky ceiling can be installed on ceilings made of gypsum ( their color is green and their are made especially to resist in wet environment ) or it can be installed on STRETCH or BARISOL type of ceiling ( with extensibile foil in metallic colors or with printed images chosen by you ). Because the optical fibers only leads light and not electricity,  makes it useble not only for ceilings but for underwater applications, creating the effect of bright points in the water of the swiming pools. The optical fibers used in these cases is protected by an outer layer of protection, opplied over the optical fibers. We usually use ties which unfold and apply ( they are removed from the protectiv tube only in areas where the lighting effect is going to produce ). If you want we have available insertable spots made aout of optical fiber.