The fact that the effect is "5 days" and "conserved across species" suggests a biological rhythm or circadian-like mechanism, not just a simple dose-response. If it's tied to a fixed temporal window, that implies an internal timing system is involved — something that's deeply rooted in evolution. That kind of conserved timing mechanism would make sense for a fundamental process like mitochondrial function. It's not just about the light, but when and how it's applied — a timing-based switch, not a linear dose. That's a different kind of biology, and it's worth taking seriously.