You can find a description of common light parameters on the lights page. Additional attributes are described below.
To use a texture map as the light color, you must change the mode of the color parameter to texture or material.
In texture mode, you can load an image as a native C4D texture (Bitmap shader). This mode does not allow the use of an Arnold shader network.
The resolution attribute should be used with care. The higher the resolution value, the longer the skydome_light will take to precompute the importance map for that light. For high-resolution maps this can be very slow.
Enable this option if you want a matching result with the Cinema 4D Sky object which flips the texture compared to Arnold.
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.