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Interesting point though as they are a solid aluminum fixture so would reasonably be expected to be min 30min fire proof anyway. Would be interesting to see if something like Zeroflame used on them would provide any additional protection.

A few comments so I'll answer the LED ones first. @Nickfromwales @PeterW @Barney12 @Onoff I initially bought a couple of samples to test for myself - i.e. run for 8 hours to see if there was any issue with overheating or radio interference. Satisfied, I then discussed with the electrician, who tested them and was happy to install them. Can't comment on the results others have had when testing other electrical equipment, but I'm satisfied on the basis of my own and the electricians input. The lights have milled aluminium casings and inset diffuser lens, which provides an initial solid barrier to flame, although I've not fire tested a fitting yet to see how long it would last. Our installation is perhaps a little different as although the majority of lights are fitted to a ceiling where the 'room' above (mezzanine study) is open to the main living area, just as the kitchen is. The remaining lights (over the stairs / upstairs) have no rooms above and are simply fitted in the service void. Our main reason for fitting them in the kitchen was asthetics. @Crofter Looking at the driver, DC output 15 - 28V I first saw the idea (recessed bank of larder units) in one of the builders houses, and simply extended the idea to frame that run of units. I'm pretty sure we'd also seen some pictures in brochures as well. We had initially been thinking about a straight run of larder units on that wall, but decided that we wouldn't have enough worktop space if we did that and settled on the design you see. Partitions / framing were built around the units, so the kitchen units went in a lot earlier than would normally be the case. A 5 mm fillet of timber was fixed to the outside of the units to create a shadow gap between the partitions and units.

Given we have MVHR, I don't see the CO2 detector as anything other than a waste of money. My proposed alternative was simply a way of getting some useful benefit from it. One of those things I had to fit to get my completion certificate... Can't say I've noticed any issues in terms of shadows / not illuminating part of the area beneath the coomb ceiling. We fitted the lights in our kitchen (12) and its like Blackpool Illuminations when they are on!