As far as I know it is a rule for Pathfinder as well.<br/><br/><div class="quoteheader"><div class="topslice_quote">Quote</div></div><blockquote class="bbc_standard_quote">In an area of dim light, a character can see somewhat. Creatures within this area have concealment (20% miss chance in combat) from those without darkvision or the ability to see in darkness. A creature within an area of dim light can make a Stealth check to conceal itself. Areas of dim light include outside at night with a moon in the sky, bright starlight, and the area between 20 and 40 feet from a torch.</blockquote><div class="quotefooter"><div class="botslice_quote"></div></div>https://www.d20pfsrd.com/gamemastering/vision-and-light/