Around 30dB or so - in other words yes very quiet, certainly quieter than the current light:
http://www.industrialnoisecontrol.com/comparative-noise-examples.htm
NB: Noise is a log scale.
I posted elsewhere and I have news that Screwfix do a "fairly quiet" option so hopefully all good.
Might...
As per the thread title, I'm looking to renovate 2 bathrooms and ideally would like to replace the clunky noisy pull switches with something quieter.
The switches will also control extraction fans so no dimmable switches can be used.
I have heard Crabtree might be quiet but would appreciate...