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Is a red bulb enough or do you need a 670nm laser?


I hope this was a joke. Don’t shine lasers in your eyes. https://en.wikipedia.org/wiki/Laser_safety


For the love of all that’s dear in this world, please don’t use a laser for that.

If you’re in a DIY mood, you can easily pick LEDs around that wavelength and they would generate more than enough light to even cause damage (if close enough).




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