Caulk Recessed Light LED Conversion?

[Art Maydan]

I'm switching the recessed lighting to LEDs using conversion kits to stop airflow to the attic before insulating it. Should I caulk these things in? They're definitely letting through less air than before, but there are still tiny gaps around the outside.

The code thing isn't a concern since I doubt anybody would ever notice, but how am I going to change the lights if I do caulk it?