Spot lights are like point lights in the sense that they affect materials depending on its position and distance, but spot lights are not omni-directional. They mainly cast light in one direction, like the Bat-Signal.
<a-entity light="type: spot; angle: 45"></a-entity>
|angle||Maximum extent of spot light from its direction (in degrees).||60|
|decay||Amount the light dims along the distance of the light.||1.0|
|distance||Distance where intensity becomes 0. If distance is 0, then the point light does not decay with distance.||0.0|
|penumbra||Percent of the spotlight cone that is attenuated due to penumbra.||0.0|
|target||element the spot should point to. set to null to transform spotlight by orientation, pointing to it’s -Z axis.||null|