I appear to be missing Light Effects plugin. It wold be in Filter-Render-Light Effects. I have Photoshop CS5 ver.12.0.0 64 bit. where can I get this plugin?
It's not available as a separate plug-in. It comes built-in to Photoshop CS5. Your best bet, if you've managed to delete it somehow is to uninstall and reinstall.
Keep in mind that in Photoshop CS5 and ealier it can only work with 8 bits/channel RGB images.
Edit: Is there some possibility this was not ported to Mac for 64 bit operation?
-Noel
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