Check out this example of a bulk-editing tool for lights in a Maya scene. LighterPro is a free python script for Maya that allows you to edit light attributes for Maya Software, Mental Ray and Arnold Renderers.
Allows to change colors, intensity, exposure and samples of all lights in the scene
LighterPro lets you easily change the basics for lights in a scene, including things like color and intensity. The script will also let you change exposure and samples for the lights in the scene, and toggles for lighting components such as emitting diffuse or specular.
