Each light type may be defined as modelling either a Point Light source, a Parallel Light source, or a Spot Light source. These definitions can be assigned and modified to create many different lighting effects.
A Parallel Light has a direction but no position. The light appears to illuminate all objects with equal intensity, as if it were at an infinite distance from the object. A Parallel Light source is commonly used to simulate distant light sources, such as the sun. It is the best choice of light to use for maximum speed generating render views.
Parallel Light sources are represented in floor plan view by three arrows. To modify the light, double-click it or select it, then click the Open Object 
edit button. The Light Specification dialog opens, allowing you to modify the light's characteristics. Any light source can be changed into a Parallel Light source by changing its light type in the Light Specification dialog.
Like a bare light bulb, a Point Light radiates light equally in all directions from its origin. It slows rendering down, but it is a more realistic representation of electric lighting and should be used where visual fidelity is the deciding concern.
If no user defined light exists, Chief Architect creates a Point Light source to represent a light within a room. Any light source, except a sun angle, can be changed into a Point Light source by changing its light type in the specification dialog.
To modify the light, double-click it (or select it, then click the Open Object 
edit button). The Light Specification dialog opens.
A Spot Light focuses the light in a specified direction. The location, cone angle, direction and intensity of a Spot Light can be defined. Spot Lights cannot be placed directly in the plan. They are created by changing an existing light's specification. Once defined as a Spot Light, the direction of a spot light can be changed in the Light Specification dialog or for an added light source, by rotating the light in floor plan view.
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