Insulating non I/C low voltage recessed halogen lights?

I purchased and installed non I/C 4" low voltage recessed lights new construction. They were installed in a ceiling of a room that was an addition. I am noticing a very cold draft on our cold nights coming from the lights (when off) due to the number of small holes in the cans. Can I user foil/aluminum tape to seal up the small machined holes inside the can to help reduce the draft that comes in? Since they were non I/C and the transformer was exposed, the insulation was kept at a distance. I should have used I/C lights but it is too late as it is all rocked and painted. Need some suggestions.

Public Comments

1. NO. Those are vents for the heat of the bulb. You cannot plug them up. The only thing you can do is get a different faceplate that has a foam seal and glass cover that will stop drafts.
2. what u can do is get some bout 150mm PVC plumbing and end caps and cut the pipe at bout 200mm long. This should still give the light plenty of room to dissipate the heat generated by the globe. Most manufactures ask for bout 150mm all around the light. Option two is that you replace the globes with an LED replacement available at jaycar www.jaycar.com and search CAT. NO. ZD0330. these produce next to no heat and are cheaper to run, down side little more expensive. Because these produce low heat you can now insulate straight over the light with no concerns