Physics

Find pendant height, ceiling drop, cord or downrod length, and spacing for island, bar, counter, or dining table lights.

Estimate a downlight light circle or needed beam angle using ceiling height, surface height, and optional spacing.

Plan recessed downlight count, grid spacing, wall offsets, and rough foot-candle brightness for a room in feet.

Estimate ceiling light fixture count, rows by columns, spacing from walls, and maintained foot-candles for a rectangular room.

Estimate ceiling light count, rows, columns, spacing, wall offsets, and average brightness for a rectangular room.

Find the safe LED strip cut mark, final length, fit difference, leftover strip, and optional power supply estimate.

Calculate LED strip density, spacing, and estimated LED count from count, length, density, or spacing.

Check LED strip dot visibility from LED spacing, diffuser gap, finish, and light pass-through. Estimate smoothness and brightness loss.

Estimate LED strip yearly cost, kWh use, power supply watts, and full-power amps from length, watts, hours, brightness, and rate.

Find LED strip lumens, lm/ft, or length needed with dimmer, diffuser loss, target area, and power supply estimates.