Recessed Lighting Layout and Lux Calculator
Wired White v2 Plan recessed-light spacing and count from lumens, beam angle and mounting height. Compare lux heat maps, average light levels and uniformity with a task target.
#inverse-square-law
Wired White v2 
Speaker SPL, Amplifier Power, Headroom and Cable Loss
Wired White v2 Estimate listener SPL and amplifier power with crest-factor headroom. Check speaker cable loss and damping across a driver's impedance curve.