You don’t need a light meter when working with video. You’d be better off using zebra stripes (a function your camera should have) and a monitor connected to your camera.
You don’t need a light meter to tell you whether or not you are properly exposed. All a light meter will do is let you know if your scene is evenly lit, for instance, if your key light is the same intensity as your rim light. To me, that information is not beneficial–well it is, but you should be able to tell with a monitor. A monitor might be more expensive, but you will get more information about the image than a light meter will give you.
