Honestly I'd go online and order an arrangement of fitting RED led bulbs and use the ones that test well with your setup. Why bother with white ones if you're going to filter out anything but red, with only the balancing act remaining of the filter transmission vs the unwanted spectrum emitter by the bulb? If you take a red bulb to begin with, secondary emissions in the green and yellow part will be small to begin with and attenuated even further by the filter. I guess the polar bears will hug you, too, because you're not wasting any energy by making light you then dissipate inside a filter.
I hear you on the red visibility bit, btw. I like my safelight red, mostly because it's the most universal color that suits the widest range of papers. Film (litho, x-ray etc) will be fussier simply because of high sensitivity.
https://tinker.koraks.nl/photography...-the-darkroom/
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