Tough choice. It doesn't help matters that none of them actually looks like a spotlight to me. What I see are a ring with a very large stone, the letters "SP" in very odd proportions, a yellow brick road, and a salt shaker.
I believe I will abstain. The existing chess pawn with earmuffs is no worse than the proposed replacements.
Seriously, I have
always had trouble figuring out what tiny colorful tilted-perspective icons were supposed to represent. It was months before someone explained to me that the jaundiced pig head in the system tray of my Windows 95 PC at work was intended to be a loudspeaker. That's reasonable in retrospect -- after all, it
did control the speaker volume -- but I could still never get away from seeing it as a pig head. As long as there's some appropriate ALT text behind it, I could live with costume jewelry or a salt shaker as the "spotlight post" icon.