Create panel > Lights > Standard > Skylight button
Create menu > Lights > Skylight

Model rendered with a single skylight, and light tracing
The Skylight light models daylight. It is meant for use with the Light Tracer. You can set the color of the sky or assign it a map. The sky is modeled as a dome above the scene.

A skylight is modeled as a dome above the scene.
Tip: There are several ways to model daylight in 3ds max, but if you use the Light Tracer, a Skylight often gives the best results.
To create a Skylight:
On the Create panel, click Lights.
Standard is the default choice of light type.
In the Object Type rollout, click Skylight.
Click a viewport.
The light is now part of the scene.
Note: The position of the Skylight, and it's distance from objects, has no effect. The Skylight object is simply a helper. Skylight always comes from “overhead.”
Set the creation parameters.

On—Turns the light on and off. When On is on, shading and rendering use the light to illuminate the scene. When On is off, the light is not used in shading or rendering. Default=on.
Multiplier—Amplifies the power of the light by a positive or negative amount. For example, if you set the multiplier to 2, the light will be twice as bright. Default=1.0.
Using this parameter to increase intensity can cause colors to appear "burned out." It can also generate colors not usable in videos. In general, leave Multiplier set to its default of 1.0 except for special effects and special cases.
Use Scene Environment—Colors the light using the environment set up in the Environment dialog.
This setting has no effect unless light tracing is active.
Sky Color—Click the color swatch to display a Color Selector and choose a tint for the Skylight.

Map controls—These let you use a map to affect Skylight color. The button assigns a map, the toggle sets whether the map is active, and the spinner sets the percentage of the map to use (when the value is less than 100%, map colors are mixed with the Sky Color).
The map has no effect unless light tracing is active.
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