Increase radius of light if lamps are stacked

[JaJe]

Stacking lamps should increase radius light as showng below:

Red - Current Radius
Green - Ideal Radius

https://imgur.com/a/7jYjUKB

The more lamps are stacked, the more light they produce and increases radius.

[Koub]

Stacking lamps won't increase the illuminated radius (apart from the lamp offset). It will only increase the illumination of the area that's within both lamps' radius.

[tehfreek]

Because that's how they're currently implemented. Changing them to use inverse square illumination will do as suggested (although require slightly more GPU power).