"Very compact, small, if not smaller than 12v downlights (bore size). Springs are very strong, pull these things down all day every day and there wont be a problem - not that you need to as theres no transformer to breakdown and get access to. Tip, once the bore is big enough and you know its going to fit, put the bulb in - far easier than fiddling about with the sucking tool to fit the GU10."
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Review 2 for Sylvania Fixed Round White Mains Voltage Fire Rated Downlight 240V
"I'm extremely pleased with these downlighters. The reliability is down to the GU10 not the luminaire, hence 3 stars. Very easy to install. The instructions say a 70mm cut-out is required, but you can use a 68mm holesaw if you have one. Always worth paying that bit extra for lighting, don't buy cheap!"