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The Standard light and Skylight are not photometric.

The mr Sun and mr Sky lights are also photometric, but are intended for use with the mental ray Sun & Sky solution.

It is appropriate to use them if you are creating a rendering that uses radiosity with exposure control.

The IES Sun and IES Sky lights are photometric lights.

The Skylight component can be an IES Sky light, an mr Sky light, or a Skylight. The Sunlight component can be an IES Sun light, an mr Sun light, or a standard light (a target direct light). Daylight combines Sunlight and Skylight.Sunlight and Daylight have a similar user interface. Enhanced menu: Objects menu > Lights > Daylight System.Standard menu: Create menu > Systems > Daylight System.Standard menu: Create menu > Lights > Daylight System.Create panel > (Systems) > Object Type rollout > Click the Sunlight button or the Daylight button.

In addition, you can animate Latitude, Longitude, North Direction, and Orbital Scale. This system is suitable for shadow studies of proposed and existing structures.

You can choose location, date, time, and compass orientation. The Sunlight and Daylight systems use light in a system that follows the geographically correct angle and movement of the sun over the earth at a given location.