vray light multiplier 0 causing black reflections

[stevesideas]

Hi guys,

Need some reflections in an object at certain stages throughout an animation. So ive animated the multiplier to change from 0 to 1 and back to 0 on a number of key keyframes. I have setup the light so only reflections and specular are affecting the scene. Also, the light is invisible (in the light rollout).

Unfortunately, when the vray light is 0 the reflections turn black..and gradually go through a gray phase up until white at multiplier 1. This is strange behaviour to me. A light wouldnt do this.

Is there any work around ? Help needed asap.

Thanks

Steve

[stevesideas]

So a workaround is to just keep the light on throughout those keyframes and just mix in post...

Still not sure why the light is behaving like that..