Lights
Soft Light:
Like Overlay, but with less contrast
Hard Light:
Like Overlay, but higher contrast
Reducing layer opacity recommended
Vivid Light:
Very high contrast version of Overlay
Reducing layer opacity recommended
Pin Light:
Conbines Darken & Lighten
Only darkest/lightest calues used
No midtones
Linear Light:
Burn and dodge midtones depending on brightness
ie. lighter color decreases contrast
darker color increases contrast