For your Dome light to work properly with Dome Tex make sure the following are set appropriately in the Details panel of the .hdr texture:
In Compression category, Compression Settings are set to HDR (RGB, no sRGB).
In File Path category, the Source File is valid and accessible. V-Ray loads the texture from that directory during rendering. If the texture is not found at the specified location the dome light will not contribute to the lighting and the scene will render black.
In Texture category, sRGB is not checked. This setting specifies whether or not the texture has linear colors or sRGB color values. In the case with .hdr textures they have high dynamic range values in linear color space and sRGB should be turned off.
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The VRayLightDome actor is accessible through the Modes > V-Ray Assets >VRayLightDome. Select the Blueprint and drag and drop it in the level.
||Modes Tab|| > V-Ray Assets > VRayLightDome
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Options
Invisible – Sets the visibility of the HDRI in the viewport.
Set for Light Bake – Enable for V-Ray Bake. This sets the skylight and directional light mobility to static. When unchecked the skylight is set to Stationary.
Dome Tex Resolution – Specifies the resolution at which the texture is resampled (No effect in viewport).
Affect Diffuse – Determines whether the light will affect the diffuse portion of the materials. The value controls the light's contribution to the diffuse portion of the materials (No effect in viewport).
Affect Specular – Determines whether the light will affect the specular portion of the materials. The value controls the light's contribution to specular reflections (No effect in viewport).
Affect Reflections –Determines whether the light source will appear in reflections (No effect in viewport).
Auto Update – When enabled, reflections are automatically updated.
