Physics

Estimate lux at your subject from a video light rating, distance, beam angle, loss, and target lux.

Find manual flash aperture, distance, power, or guide number with ISO, power, and modifier loss adjustments.

Estimate aquarium PAR targets, daily light amount, surface PAR needed, coverage size, and simple tank volume.

Estimate soccer field fixture count, lumens, average foot-candles, lux, power use, and energy cost from field and fixture specs.

Estimate basketball court foot-candles, fixture count, fixture lumens before losses, lux, and power for a planning check.

Estimate fixture count, maintained lux, foot-candles, power use, and monthly energy cost for tennis court lights.

Estimate stadium LED fixtures, field brightness, installed power, event energy use, and cost from area, target light, and fixture specs.

Estimate pool lights, total lumens, rough spacing, and optional yearly energy cost from pool size and fixture lumens.

Check low-voltage garden light watts, transformer size, voltage loss, wire gauge, and split-run fixes for one cable run.

Estimate path light count, spacing, average brightness, and watts using fixture lumens, path size, layout, and useful light percent.