Dog,

If how I understand the process is accurate, then it would seem logical that the Far Red in the daytime should also count towards speeding up the plant's clock. And that means the Red during the daytime would also count towards slowing the plant's clock. When you change to a higher K bulb, you're adding blue, but you're also taking away Red, which means there may to be a higher proportion of FR:R, which would speed up your plant's clock and mess with your experiment about blue light. It's just a thought, not sure if it's right.

Your pics look good. I can't really say anything about you using a camcorder because look at me, I have no working camera at all! My HDF looks way more veggy than yours There's a full stem out the top of the cola with more growth on it.

If you're going to use regular incandescents, use clear ones (and Sal agrees). The phosphors are a better human eye spectrum but are not as good for the plant spectrum. And yeah, you probably do have too slow a spectrum at night.