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I built my own rear light which looks not dissimilar to what you're describing.
https://www.youtube.com/watch?v=UA0nWw4gMRc
I realise this is no help
Just to clarify though - I don't necessarily need one exactly like that - they just looked cool when I saw them and fit the bill in regards of having a rather large, bright area.
Ideally it would be much larger even - like, say, an iPhone - that just displays a bright red screen.