I'm in the process of doing a bungalow loft conversion and am almost at the stage of first fix electrics. I've had to pack out the rafters to a 6" so I can get 100mm of kingspan in and have some air circulation too. I was wanting to add LED spotlights in the ceiling but was worried about drafts coming through them seeing as I'll have to put a hole all the way through the insulation. Is it possible to get a sealed unit that won't cause a draft or is there another alternative