HDRI maps are wonderful lighting and environment tools since they give you both a scenery to play with, all the lighting already pre-made, plus, you save geometry memory and free up lots of rendering speed.
However, all those benefits come with a cost: You can't alter the lights/shadows without rotating the scenery, which often creates a mismatch: You're either happy with the lights and shadows, or the background, and very seldom both. Plus, you can't change the intensity of the lighting on your models without at the same time, altering the overall background brightness.
In this advanced DAZ Studio Iray HDRI tutorial, you'll learn how to overcome those limitations, and get 100% freedom to get individual background, lighting, AND shadows from the same HDRI map. The best of both worlds!