How to get to 32-bit mode in Photoshop on Yosemite

Having a problem. I need Photoshop to run in 32-bit mode in order to access "Lighting Effects". Photoshop users will know what I'm talking about, it's unavailable and greyed out in 64-bit mode. But I don't see the option to select it. My understanding is that it should appear under General: "Run in 32-bit Mode" but it's clearly not there. Is there another check box or something somewhere else I need to check in order to gain access to them? Do I need to do a 32 bit kernel install or something?

This is Adobe's response. It's for CS5, but the information is still valid. It is kind of frustrating though that they haven't brought lighting effects to 64-bit when they've now had CS5, CS6, and multiple versions of CC to get it done.

Still, I don't see the 32-bit check mark and Apple's support documentation says it should be there. I don't know if Firevault interferes with it or not. I am running regular HFS+ (not case sensitive).