Yesterday one of 4 LED lightbulbs (Philips brand) in the office started flickering.

While I was marvelling at such a thing, all 4 went dim instantly at the same time.

And dim they remain.

I know LED bulbs will get dimmer with age, but surely not with synchronised swimmer precision.

Before I go to Mitre10, something I can do during todays outage, and buy new bulbs, is this likely to be an electrician thing?