Gaffer Set-Lighting Photometrics: Lux / Footcandles, Diffusion Loss & Camera T-Stop Solver

Deterministic Inverse-square candela luminous intensity E = I_beam / d^2 * 2^(-Stops_diff) -> ANSI PH2.12 incident exposure equation T^2 = E*t*ISO/C engine (.pdf, .json, .csv) built for Aputure, ARRI SkyPanel, Nanlux Evoke, Sekonic — zero-upload ephemeral Wasm RAM execution.

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