You can use standard Maya lights when rendering with MtoA. If you select a light and then inspect the Maya attribute editor, as well as the regular light attributes, you will also see a new group of Arnold attributes for the light, which is where any additional settings used by Arnold can be accessed.
The Maya Ambient Light and Volume Light are not supported by MtoA.
Ensure that Light Linking is set to none when instancing lights, otherwise the instanced light will not render.
As well as honoring the standard Maya light attributes, the Attribute Editor will also show the following attributes under the Arnold group:
The temperature of an ideal black-body radiator, in kelvin units, that is used to determine the color for a light source. The default color is set to 6500 K, which is considered as the white point by the Commission Internationale de l'Eclairage (CIE). The color ranges from red, through to white and then to blue. Values above 6500 K will give a cool color, whilst values below will show a warm color.
'Volume Samples' does not apply to the 'Volume Scattering' atmosphere shader. To improve the quality of the 'Volume Scattering' shader, you must increase the 'Volume Scattering' samples.