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- Oct 3, 2011
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I've got one of those tiny little 650nm diodes you buy by the dozen at ebay. One of them metered at 31mW, several others between 25-30. They are the little 6mm ones that cost about a buck or less with shipping. You can have one of these if you want. I can meter it for you as well. Probably not a good estimation of a 589 though. My 556nm I recently bought does around 80mW and it's quite visible. Not too much difference between it and a 110mW 532nm I have to be honest. Looks a little brighter than the green does.