Needing a Catch Light

I am looking into a catch light and was looking for suggestions. I've been looking into how they can really make an actors eyes come alive in a scene and was wondering if anyone had recommendations. Do you use a light specifically as a catch light or do you use a bounce or something?
Comments
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Its going to depend entirely on the lighting setup you are already using for the scene. It will also depend on whether you want a round or square catchlight, as to what you use to create it.
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As Axel mentioned, it really depends on you setup, but most any light behind the camera (or near there) should show up in the eyes. If it's a close up, a reflector just out of frame can be used to create a nice catch light too.
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Anything that's bright will work, as long as it's in the actors' line of sight. I often use a gentle fill light to get a catch light, and quite often it's enough just to have the actor looking in the direction of something bright, even if that something isn't bright enough to illuminate them.