Similarly, the spotlight in Arnold has a lens_radius parameter that, when set to a non-zero value, and coupled with a low angle, has the apparent effect of flattening the decay, like in a Hollywood-style searchlight. However, Arnold's quad and disk area lights have a spread parameter, that when set to a low value, will give you something similar to a constant fall-off. Arnold does not support constant light decay.Info: More information about light samples and removing noise can be found here.
You can use standard Maya lights when rendering with MtoA. If you select a light and then inspect the Maya Atttribute 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 Arnold User Guide provides the full documentation for Arnold lights. The Arnold for Maya User Guide explains how to set up Arnold lights in the Maya user interface.
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