That's not entirely accurate regarding visual filters... there's a significant level of attenuation but how much depends on the construction of the lens and the effectiveness of the dyes used. Think about it, the incandescent lamps you're using presently emit an even broader range of color yet your lamps still look nice and red. Looking at their example I'd say they were running some very blue white LEDs in there. White LEDs do not emit all colors and as such their performance will vary. Running red LEDs you do still face a real concern of attenuation and a resulting dim appearance.
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