Ceiling spots in wooden beam ceiling with blown-in insulation (intermediate ceiling)

Hello everyone,

how are ceiling spotlights or similar installed in a wooden beam (between) ceiling that has been insulated with blown-in insulation and is not suspended? It must be prevented that the insulation falls through the hole of the ceiling spots. Am I correct in assuming that the beams are covered with OSB on the top and bottom and that the blown-in insulation is then placed between the beams? I am not referring to the top floor ceiling, but the ceiling between the ground floor and the upper floor. And the blown-in insulation is only supposed to provide soundproofing. Thank you very much

Blown-in insulation as soundproofing? I have my doubts that it helps that much.

For ceiling spotlights, hollow cavity boxes can be used and the cables can be routed with empty conduits. That should be sufficiently sealed or can be made so.

How should the intermediate ceiling be better constructed to achieve sound insulation?

A screed would be sensible.

Heavy, the denser the material, the better the sound insulation.

Yes, a screed should be applied. But then blown-in insulation is better than mineral wool, since it is heavier.