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As I also always say, it rather intrigues me that good few of those who now advocate (or stronger) SPDs are the same people who, not too long ago, ridiculed (and described as 'snake oil' or 'a waste of money') any mention of 'surge suppression'. Have these people perhaps suddenly strated experiencing lots of equipment failures which might possible be related to supply 'spikes' ... or what?
I am one, who some 10 years ago felt that a spike or surge is unlikely to get past the power supply into a computer, I still don't think that can happen, but maybe it can damage the power supply.
I consider one location, my old (now my sons) kitchen lights. As far back as I can remember been fluorescent, and some times they would fail to strike, and the 65 watt tubes would last around 5 years each.
The demise of the 65 watt tube resulted in using 58 watt tubes, likely the ballast designed for 240 volt, but voltage never seemed to have dropped, but life reduced to around 2 years with 58 watt tubes, then a load of houses had solar panels fitted and the voltage dropped, and now tubes down to 6 months, so due to poor access went to a 24 watt LED tube, removing all control gear, this was not very long lived, around 18 months, replaced with 22 watt, then my son replaced with GU10.
He had a lot fail and blamed them being cheap, but does seem odd, it is the kitchen having problems. As it if switch damaged with fluorescent lamps, or spikes or just cheap.
But I also use cheap lamps, and very few have failed, can count on one hand, and I have a SPD fitted. Once I was indecisive now I am not so sure.