Hi, I see your plant is getting bright sunlight throughout the day, do you mean it received direct sunlight all day or few hours of direct sun and the rest of the day just bright? That make big difference in VFTs appearance, as VFTs like plenty of direct sunlight.
Sunlight is the best to grow VFT, if sunlight doesn't make it red, I doubt the grow light will. But I heard big difference in day and night temperature will make the traps or plants to go redder provided the plant is not a green form.
Cobra lily is hard to grow here, I have tried growing under sun, they refused to get bigger and eventually died. I am now trying another attempt with different conditions, I really hope to find a way to grow this lovely plant

in the tropic, a simplest way to grow them, without any expensive equipment. I know that's hard, I know I'm dreaming, but..... just let me try it out.