Discotheek | Use your monitor(s) as spotlight for Windows, macOS and Linux

Use you monitor as light

Stroboscope

Lava lamp

Multiple monitors support

Free

Windows, macOS and Linux

Transform your computer monitor in a color spot light
Transform your computer monitor in a strobe
Use your computer monitor as a light
Vary the speed of the light flashes
Define colors, timing
5 Presets
Fade colors between colors
Accept command line arguments
Support multiple screens
Run on Windows, macOS, Linux
Free, no ads

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Discotheek screenshot

Add, remove colors
Define time to show colors
To show a color longer than the rest, add the same color again (See Stroboscope)
Hard or smooth transition between colors
You can vary the speed while in full screen (F1 for help)

Rainbow: Many vivid colors flashes.
Stroboscope: Simulate a stroboscope with your screen. Mostly black and a white flash a few times a second.
Lava lamp: Bright colors with smooth transition every 2 seconds
Dark: Set your screen black without shutting it down
Light: Change your screen to a light with this white screen

You can choose a different skin
Save your preferences in differents .ini files.
The main window can always be on top and be transparent.
You can run it on Windows, macOS, Linux and (not tested) others operating systems that have Java.

Video