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I meant round "equivalents" of 600mm square panels. Although preferably not 600mm dia. I guess just a "standard" where a choice of xmm dia round panels was always, and would always be, as wide as 600x600.

An interesting tale of "teacher says" interaction

Doesn't have to be moulded though, does it?

But I can say with absolute certainty that if lighting was made up to a quality standard and not down to a price there's no reason why products couldn't last for decades.

They can't and don't test, and AFAIK don't survey, the longevity of integral lights.

It does. On the plus side, you know you're always going to be able to buy 600mm panels. What we need is for a de-facto standard for round lights to become established.

It's also what I need to buy to meet my wants. I don't want miniature - 250mm ± diameter is ideal, but I want as low profile as possible. I'd have totally flush if I could, but then I would be really hosed if I couldn't get replacements exactly the same size.

Never had the syncing problem except with the couple that have emergency supplies. My knowledge of "bulkhead lights" is that they are bit pedestrian-subway-ish. Maybe I should find the cheapest ones I can and buy a large number - if the ones I have now are typical they don't take any longer to...

If that were a large cooker hood its footprint could be 2m wide and 1m high.

That's what my parents called sockets.

Deep joy. Can't even rely on makes like Philips/Thorn/JCC? 2 years according to the people we got them from, and yes, we'll be OK with these failures, but what of future years? I'm strongly minded to get refunds rather than replacements, if I can, ditto for any further failures over the next...

Eric - I'm not buying bulbs, I'm buying integral lights. I do have other lights which use bulbs, and no doubt I'll find makes which are reliable and ones which aren't, and if I have a mix it'll be OK unless there's a marked difference in colour temperature. But for these ceiling lights I want...

Or to anyone who argues that a zone is as wide as a TV because it's inconvenient for him for it to be only as wide as a socket.

Do I? I'm sorry to hear that. Thanks for the recommendation.

I'm in the market for some low-profile, round, surface mount LED ceiling lights 220-250mm dia,15-20mm deep, white, 18W or a bit more. Wall switch operated CCT would be nice, but failing that 3000K. I have already got quite a few Knightsbridge CPL18CTs, which I thought were an OK make, but...

I need a few. The usual-suspect websites are awash with hundreds of different makes, all the same. The problem is if you're churning them out by the gazillion at low margins, I can see the temptation to switch from using the finest chinesium to B-grade, or to skimp on the plating, or to...

https://www.thameswater.co.uk/help/water-meters/compulsory-meters-in-our-region

Because water is on a totally different level of necessity compared to optional cornflakes, beer, electricity or petrol (etc. etc. etc.), and there's a good case for saying its supply should not be a source of profit, particularly when the water companies won't fix leaks, won't stop polluting...

I'm aware of millions of existing properties which were put under the greatest amount of pressure possible to have them installed. That pressure being "we're going to put you on a metered supply whether you want it or not". The only way to prevent metering being disconnecting your house from...

I find gradually working up in sizes is a good way to avoid blow outs, and once started to drill from both ends with each larger size. I don't mean trying to meet in the middle, but just about 20mm in from one end before working from the other end. If inside is lightweight blocks, plasterboard...