When using Color Management in Maya (2017), HDR maps should be set to RAW. More information can be found here.

A tutorial that uses the Ai Skydome light can be found here.

 

The lights page has more detail about the controls. The only additional attributes are:

Color

 The Skydome light has a texturable color slot so that you can map a texture to be used for IBL.

 

Intensity

Resolution

The resolution attribute should be used with care. The higher the resolution value, the longer the skydome_light will take to pre-compute the importance tables for that light. For high-resolution maps, this can be very slow.

Format

Portal Mode

AOV Indirect

Visibility

Camera

Transmission

Diffuse / Specular / SSS / Volume

 

Viewport

Note that 'Hardware Texturing' in Maya's viewport will only work when using a Maya file texture with the Ai Skydome light. Using an Ai Image, for example, will return black in the viewport.

Sky Radius

The size of the sky in the Maya viewport.

Facing

The direction that the Color texture map faces in the viewport. Can be set to Front, Back or Both.

Currently, the Ai SkyDome light will not appear in the light linking window. A workaround is to use the defaultLightSet to change light linking options for Arnold lights (make sure to refresh the IPR when making changes in the light linking window). A video demonstrating this process can be found here.

The Skydome light will not work with Atmosphere Volume. You must use regular lights that have a precise location and size, and inverse-square decay.