it appears the spectrum changes as the color does That happens with any light. The colour of light is defined by the part of the light spectrum it falls on. Don't stress it too much though. Any half decent grow light from a semi-reputable company nowadays will be good enough for your purposes. More on reddit.com

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You are asking for products that are possible but complicated and expensive to produce. There are little incentives and it's fairly niche so the lack of affordability and demand means low profits. Full spectrum lighting usually means high tm30 specs plus IR possibly some with UV. That's different than circadian spectrum lighting which is cct changing that follows a time clock. Technically all lighting can be considered circadian to a degree. As you manipulate not only brightness but the amount of blue light exposure to the body. I think a bit of your issue is understanding/education on the topic at hand, and also the market not being quite there yet to make accessibility easy enough for you to test your goals. More on reddit.com

I use weird lights to test on variegated plants and hoyas with splash or silver leaves. More on reddit.com