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I have a talangensis x robcantleyi that is slightly larger than your plant there.

All my cephs are flowering at the moment. Here's a few of them. They are all grown up now! Of course, I am busy with my paintbrush and hope to repay other growers for their great generosity

White LEDs are made of blue leds, not red. White LED = blue led with a filter.

I think that most of the coloring of the plant, especially red, is caused by red color in the light spectrum. This is based on my experience with my plants. The same plants had only high blue (10000K) tubes for years and the leaves did not color up at all (neps). Then after I switched to plant tubes which have more red, I got red on the leaves. Same goes for cephalotus. I had a 6500K LED spotlight (just a cold white LED) for a typical cephalotus so close to the plant it almost touched it and almost no red on the pitchers (although vigorous gowth). Later I upgraded the lights to LED fixtures which have blue, red and white and after a while I got very red pitchers and the light was farther away from the plant. All of these plants are indoor, in a terrarium with lowland temps and humidity.