<b>D-LUX: Derived Light Unit Exaform</b>

D-LUX: Refining the Metric System by Correcting Historical Error and Optimizing the Speed of LightAbstract:<br>This brief presents D-LUX (Derived-Light Unit Exaform) as an alternative derivation of the SI unit system, maintaining full compatibility while correcting a long-standing metrological error in the meter and defining the speed of light as exactly 300,000,000 Lm/s. The small inherited geodetic error (~0.02 mm) in the original meter definition has persisted through modern SI standards. This correction, alongside a refined definition of c, results in a cleaner, more objective unit system that is particularly beneficial for high-precision physics, cosmology, and engineering applications.Key Takeaways:Fixes a known but uncorrected metrological error.Reframes c as an exact, round number without altering fundamental physics.Preserves all SI relationships, affecting only spatially dependent quantities.Provides a practical alternative system that could naturally influence a future SI redefinition.This document outlines the rationale, implementation, and impact of the D-LUX unit system, showing its advantages over the current SI structure.