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Oct 6, 2021 at 19:52 comment added AlienBoy Thanks for the explanation! With everyone's discussion, I now know my question is flawed and where the flaw are. There's much more factors to consider and you did point me at the right direction.
Oct 6, 2021 at 19:49 vote accept AlienBoy
Oct 1, 2021 at 14:02 comment added user16324 +1 for finding an actual 500K incandescent! Blue filter (lowering efficiency) is indeed the only way.
Oct 1, 2021 at 0:20 history answered Bruce Abbott CC BY-SA 4.0