Physics

Estimate outdoor lights needed, actual brightness, total watts, yearly energy cost, transformer size, and a simple spacing hint.

Estimate parking lot light fixtures, installed lumens, maintained brightness, and rough pole spacing from lot size and fixture lumens.

Estimate shop light count, row by column layout, spacing, power use, and yearly energy cost for a garage or workshop.

Estimate office light fixtures from room size, lumens, target foot-candles, room efficiency, and dirt or age losses.

Estimate warehouse lights, rows by columns, spacing, foot-candles, and optional daily energy cost from room size and fixture lumens.

Estimate garage lumens, fixture count, ceiling layout, maintained brightness, spacing, and optional monthly energy cost.

Estimate bathroom lumens, bulb or fixture count, and a room-to-vanity lighting split from bathroom size and brightness goal.

Estimate kitchen lumens, new light count, lux, and LED watts with credit for lights you already have.

Estimate ceiling light width, shopping sizes, fixture height, and hanging clearance for rooms, dining tables, or islands.

Find chandelier width, hanging height, floor clearance, and drop for a table, dining room, entry, or open room.