From Manufacturer
The LumiQuest ProMax System allows 80% of the light to bounce off the ceiling while 20% is redirected forward as fill light. The system includes interchangeable white, gold and silver inserts as well as a removable frosted diffusion screen. The ProMax System will give you studio-like control in a convenient kit that attaches in seconds with touch fastener tabs and folds flat for storage in a sturdy pouch.
The 80-20 allows for ceiling bounce with 20% fill.
White insert provides a neutral bounce surface when no ceiling is available.
Gold insert warms the light for late afternoon fill.
Silver insert adds a more specular look to the highlights while maintaining shadow softness.
Light loss varies between 1 - 2 stops, depending on insert used, and the height of the ceiling.