Lighting too dark following Windows Update

So my PC has just had the “April 2018” Windows 10 update. Now ALL the lighting in my project is very very dark. Sky box and main light source excluded.
Obviously I do not want to have to go through each and every individual lighting setting in every level. Has anyone else come across this following an update.

Is there a general project setting I can set? Also worried that changes that work on my development machine may be too bright on other machines…