revision sic : blue light, vitamin D

So my kimchi batch since the top of October has had a too-high ratio of Ca to Mg. Compounded issue with my bumpy calcitriol supplementation. This correlated down to muscle tightness during fatigued longer runs. I think I have fixed the calibration.

Meanwhile a friend mentioned winter sickness, so I did some revision on D and the blue light pathway. 

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Nerdy details:

- bulb products: 3000K has the least blue light, 6500K has the most

- you want more blue to wake up, and less blue to get sleepy

- blue triggers signaling that has nothing to do with vision: one signal even has to route out of then back into the brain to the pineal, which evolved from an ancestral first eye that is now buried :p ...

- vitamin D is a critical co-factor in downstream effects

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Also, it turns out that the body reacts to hypomagnesemia by throttling vitamin D activation, and thus calcium uptake and retention