No light is projected outside the cone.
The limitingConeAngle attribute represents the angle in degrees between the spot light axis (that is, the axis between the light source and the point to which it is pointing at) and the spot light cone. An anti-aliasing technique is applied at the boundary of the cone.
If no value is specified for the limitingConeAngle attribute, then no limiting cone will be applied.
- Scalable Vector Graphics: Filter Effects, Section 15.25.16
Microsoft Developer Network: [Windows Internet Explorer API reference Article]