Personally, I am most willing to trust my eyes. I look forward to trying the new LED's at some point, but I still have yet to see anything that comes close to the Solux bulbs. To me, this makes sense. The sun, halogen and incandescent all produce blackbody radiation. Other technologies produce light with different techniques, and then try to correct the spectrum as best they can. Halogen and Incandescent already have it more or less right, they just need adjustment in color temperature. As far as I can tell, the only disadvantages of halogen are heat generation and efficiency as compared to LEDs. Their relative longevity is lower, but extends for years in good bulbs. In exchange, you get the best color reproduction, unconstrained dimmability, instant on and off, a pleasant, directional light (useful for different areas of the darkroom...more light over the viewing area than the enlarger, paper safe etc), and cheap bulbs. Where I live all the energy is renewable, so the extra energy is offset by the lower environmental impacts of the bulbs and fixtures themselves (no ballasts, circuit boards, mercury vapor etc).
This is a few years old, but the list on the website is still maintained. Pretty interesting regarding the LED's. Good stuff is out there, but it seems like it can be tricky to find.
https://www.cinema5d.com/led-light-accuracy-tlci/
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