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Message: <blockquote data-quote="Infiniti2000" data-source="post: 3160489" data-attributes="member: 31734">Unfortunately, there are no rules establishing the exact point source for light like there are for spell effects.  To make the world consistent when you cast area effect spells, however, it's better to just using the grid intersection as a guideline for lights (and darkness).  The other problem with not doing this is that you need different templates for effects originating in a square vs. the well-defined ones for originating on grid intersections.Light - how it's measured --It originates at a grid intersection and the radial (and even cone) templates for that are pretty well defined.Vision - works the same? --The same thing.  The creature picks a corner to measure from.Intersections - which are valid? --A creature holding a light source should be able to pick the grid intersection from the origin of the light source.  A creature place a light source somewhere should be able to pick the grid intersection for the origin of the light source.Widening resultant light area of effect --If you do not set a grid intersection as an origin, then you need to decide what happens in the perimeter squares.  They will be "half-filled".  I would rule that as a lesser condition, if available, or nothing at all.  In other words, the perimeter squares for light would be in shadows.  The outer perimeter squares (normally shadowed) would be dark because there's just not enough light reaching that square to sufficiently illuminate it.Ability to move light sources --Yes.  As I indicate above, I think you should be able to move the light source from one grid intersection to another (assuming it's not placed on a permanent object of course).Action to move light sources --Completely undefined, of course, but I'd say making it a free action is fine.  It cannot be an immediate action IMO and a move action is just too much to what I feel basically amounts to a negligible shift in positioning.</blockquote>

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