We replaced all of our R80 bulbs with Philips 9w e27 800 lumen r80 warm white LED's a few years ago. No changes required to light fittings - just unscrewed the old bulbs and screwed in the new LEDs.

We have just moved into a house that has old incandescent downlights which are open through to the roof space therefore they are inefficient and letting all the warmth escape the house into the roof ...