For clarification, I use the following;
After putting on the holo, I duplicate it so there are two holo layers.
Rear holo layer - multiply mode - opacity 25 percent
Front holo layer - color dodge mode - opacity 80 percent
If you don't know how to get to the layers command to edit mode and opacity on Photoshop, go to the Window menu and select "show layers".
Thanks Ivar, very useful
