I would like to convert my downlights to LED. However, the LEDs I've found have holes around them to let the air though. I've been told this is for ventilation purposes and blocking these holes or putting insulation over them will cause the LED to overheat and shorten their lifespan.
Changing from a halogen to LED, I'm going from about 35W to about 5W so there's certainly benefit there but I'm wondering whether it's still worth it because these holes are going to create drafts and increase my heating costs.
How much heat is generally lost due to unsealed downlights? Is it a negligible amount or is it comparable to the energy savings from converting to LED?