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maybe because 593.5nm are very inefficient compare to 589nm..... cost more to produces+less profit margin.... And as we all know Companies prioritize profit before any other factors...
They're about the same efficiency and ease to generate, its just that the process that generates the 593.5 is more unstable at high temperatures. it is actually better than 588.6 at lower temperatures. and yes there is a notable color difference. the 593.5 is noticably more orange than 588.6. They're both very warm pretty colors though.
comparison at roughly equal powers: