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 fixtures, required lumens, and planned average light level from room size, target light, and fixture output.

Estimate maintained lumens for a warehouse zone and, with fixture lumens, estimate fixture count, average footcandles, and a grid.

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 a ceiling light width from room dimensions and check a table or island fixture range before you shop.

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