The Light menu settings are described as follows.

Position X, Y, and Z fieldsPlaces the light source in the scene.

Rotation X, Y, and Z fieldsRotates the light source.

Path buttonAnimates the position of the light using a spline drawn in the scene. Disable Path to animate the position of a light using explicit animation.

MBlur buttonEnables or disables motion blur only for the light.

Shading buttonEnable to light up the scene using added light sources. When Shading is disabled, no lighting effects appear in the scene; surface and 3D models appear flat. This same button appears in the Rendering section of the Action Setup menu.

Intensity fieldAdjusts the intensity of the light.

Spread fieldUses a light source as either a point light or a spotlight. A point light radiates light uniformly in all directions. A spotlight radiates a cone of light centred along the spotlight direction. Use the Spread field to change the spread angle. A spread of 90 or less creates a spotlight.

Falloff fieldAdjusts the amount of falloff around the edge of the light source. This value also changes the size of the specular highlight. A lower falloff value creates a larger specular highlight.

Enable buttonTurns the selected light source on or off.

RGB fields and Colour potChanges the colour of the light source by entering values in the red, green, and blue channel fields or using the colour picker.

Settings for controlling the light bevel curve are located in the Light Profile tab.

Light Bevel curveAdds a specific profile to the selected light. Use the options in the Edit Mode box to add, select, delete, or move keyframes on the bevel curve. The bevel curve behaves in much the same way as an animation curve in the Channel Editor. See Using the Light Bevel Curve.

Home buttonResets the Bevel curve viewer to show the whole curve.

Undo buttonUndoes Bevel curve operations.

Reset buttonResets the Bevel curve.