The Blind Effect places dark horizontal stripes areas across the video. The name refers to Venetian blinds.
You can control three properties of this effect:
Frequency is the number of darkened stripes to be displayed across the height of the video. If the frequency high, much of the view would be hidden behind the dark stripes.
Light Strength is the intensity of light falling on the video. The greater the strength of the light, the more distinct the shadows (dark stripes). At higher values, the waves become so strong that they appear to cut the video in strips.
At lower values, the blind may not show at all. A value of 25 - 50 is ideal in most cases.
Changing the phase changes the vertical locations of the stripes of the blind. It lets you adjust the position of the stripes up or down.