Revit has a built-in parameter for adjusting the photometric tilt angle for luminaire families.  By default, this is a Type Parameter, meaning all instances of a given Type must have the same Tilt Angle.  This can be inconvenient for applications where different luminaire aiming is required.  The Tilt Angle can instead be controlled using an Instance Parameter, by making a few simple edits to the family file.

Step 1- Add a new Instance Parameter with the settings shown below.

Step 2- Associate the new Parameter with the Light Source's Tilt Angle

Step 3- Adjust the Instance Parameter in the Project Environment

An example family is attached, at the bottom of this article.