I followed this tutorial but in the end I could not get it out of 32 bit mode. It kept wanting to process in HDR pro. I wanted to change the mode to 16 bit but was not able to. I was happy with the image but it was completely unavailable for saving.
Not all formats support 16 or 32 bit modes. When moving from 32 bit mode you are shown a dialog box, that is to set a balance to your liking for how it should look in 16 or 8 bit mode.
A 32 bit mode can be saved as a psd file and maybe a tiff file, but really there are not a whole lot of other formats that do support 32 bit mode. Oh yea pdf will as well.