Greetings, Light intensity falls off by the inverse square of the distance to the light source. For instance, doubling the distance to a light source will decrease the light intensity falling on an object by a factor of 4. -|<ipp > From: rdevries@comcast.net > Date: Fri, 6 Nov 2015 19:19:11 -0500 > To: pbs@lists.ibiblio.org > Subject: Re: [pbs] Growing under lights > > What is this inverse-square law for light ? > > Rimmer > _______________________________________________ > pbs mailing list > pbs@lists.ibiblio.org > http://pacificbulbsociety.org/list.php > http://pacificbulbsociety.org/pbswiki/