Here you can determine Spot light parameters.

Cone angle – angle of light funnel.

Penumbra angle – gradient of shadow boundary, can be equal or more than cone angle.

Barn-Door effect – four side shutter for light. The values are:

Left Door angle – left shutter value.

Right Door angle – right shutter value.

Top Door angle – top shutter value.

Bottom Door angle – bottom shutter value.