Set here the translation vector applied to each new light
copied from a light or list of lights. Directional lights
have no position, so
Shift does not affect them.
By default, each copied positional or spot light has
the same position as the original light. This is expected
when copying a light or a list of lights to a different layer.
However, when each new light is in the same layer as the original
light (for a list of lights, the
Local option in the
Layer menu), a small shift helps to separate the
lightning effects produced by the new and original lights.
All other properties are the same for copied and original
lights (only the identification numbers are different).