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Triggering Rainbow Streaks?

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You know how when you shine a light at a flatscreen TV that's turned off and you see those rainbow streaks going in 4 directions? Was just wondering what ways there are to trigger that rainbow spectrum projection onto a background for a killer high-saturation shot.

 

Shining a 300w through a special piece of optics?

 

Is there something in cinema specifically for this? Is there a common household trick I'm ignorant to?

 

Thanks!

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Diffraction grating. I'm not aware of them being used as filters for high power lighting, though. The type depicted below would not handle any useful amount of light.

 

s-l640.jpg

 

Simulate it with a video or slide projector?

 

 

 

P

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