ᐅ Insulating a Suspended Ceiling? Heat from Ceiling Spotlights?

Hello everyone,

the topic of insulation in our timber frame construction is still driving me crazy. After reading everywhere that even at the installation level it is important to avoid any gaps in the insulation, since air could circulate freely there, I made a special effort to prevent this (which was already quite challenging with all the pipes, cables, and ventilation ducts).

Now the electrician has instructed me, for the suspended ceilings, not to fill the full depth of the joists with acoustic insulation (mineral wool boards), but to leave some space so that the heat from the recessed ceiling lights can be dissipated. But wouldn’t this create exactly that kind of gap again? Or does it not matter because the ceiling above is not an exterior wall?

And how about the ridge beam under the attic roof? According to the insulation manufacturers, it is best to install a horizontal insulation layer below the ridge beam (since the ridge is a particularly critical spot), but then I wouldn’t be able to install recessed lights there either.