Grouping and keyframes

I have a scene with 136 lights.  For the first 11 seconds of animation, these lights  move and illuminate independantly.  from 11 seconds to the end of the animation, they no longer move, but frequently change range, and they do so in unison.

 

Here is my problem:  If, at the 11 second mark, I select all of them and add range keyframes to the end of the animation, they loose all independant keyframes for illumination/range/etc up to the 11 second mark.  They still move independantly, but they no longer light up or dim when they are supposed to.  Is there a way to add the range keyframes after the 11 second mark without having to do each light independantly, and without loosing keyframe info for each individual light up to that point?

 

Thank you for your time.

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