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1500W of LEDs is... rather bright; on the order of 150000 lumen. I guess there will be significant losses perhaps, but I sure hope most signage is using a lot less than that.

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For context, this is what 100W of LED looks like [1]. Those signs don't come anywhere close to this.

[1] https://www.youtube.com/watch?v=FsrAV1Qh4fs

That's what it looks like when you have a small module and put it in a flashlight. What does it look like as a 15m2 billboard?

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