A fibre-optic ceiling has no electrics in it. One LED engine sits out of sight and every star is fed down a glass fibre. What arrives at the ceiling is light. Nothing else travels up there.
So nothing overhead gets hot, and nothing overhead conducts. That is why a star ceiling belongs above a bath, a steam room or a swimming pool, where a ceiling full of fittings never could. It is also why there is one unit to service instead of hundreds of bulbs, and why the fibres will still be doing their job long after a bulb would have gone.
It is the reason this trade suits the rooms people care most about — the ones with water, children or a very expensive screen in them.