Animate VRay plane light on and off

[Streetwise]

I would like to turn a light off so I added a visibility layer to the Dope sheet. Key 70 is "1" and Key 71 is "0". The curves assigned are both non-bezier (no modifier handles). Still though, when I render frame 69, or 72 for instance, the light is on in both. What else do I need to do?

Thanks.

[Streetwise]

I gave up on the visibility idea and am trying the approach of keying the Multiplier. When I scrub the timeline, I see where the modifier goes from 200 to zero, but if I render a frame where it's on 200, I get nothing.... It worked before I started messing around with keying. So I know that the key for the multiplier works, its just why the light doesn't seem to render.

[Streetwise]

Light "color" somehow got changed to BLACK!? SMH. Putting back to white and everything's a honky-dory. So in the end animate the Multiplier and you'll be good to go! Scheesh.