I am quite taken by these, if JCC can confirm how many I need for a 4x4.5m room.........or anyone else!
http://www.fastlec.co.uk/jcc-mini-compact-jc5091-18w-downlight-housing-p-6509.html?zenid=dm35vk3apssbsut1r002gogij0
Can you tell whether 6 x 18W will be far cleaner and lighter than 10 x...