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Free lighting tools

Quick answers.Better starting points.

Use these calculators for early planning, spacing, and sizing. When accuracy matters, verify the design with manufacturer IES files and a project-specific photometric model.

Planning guidance, not a final design. Results are simplified first approximations. Reflectance, optics, mounting, obstructions, controls, code, and actual photometry affect performance.

Four calculators + IES Studio

Test the inputs. See the result immediately.

Adjust room dimensions, light targets, artwork sizes, electrical loads, and unit systems. Results update as you type. Open IES Studio below to inspect real fixture files.

01

Room lighting calculator

Estimate light output and a first-pass ceiling grid.

Combines lumen output with a geometric spacing preview. The grid assumes a nominal 60° beam and a 0.80 work-plane factor; verify the final layout with the selected fixture’s IES file.

Estimated lumens

22,286 lm 416.0 ft² at 30 fc

Suggested grid

4 × 3 12 fixtures total

Approx. spacing

6.8 ft Wall offset ≈ 3.4 ft

Approx. fixture lumens

1,858 lm Minimum each for the suggested grid
02

DC cable size

Check voltage drop.

Copper conductor estimate for a two-way DC lighting run. Length is one-way.

Suggested conductor

8 AWG7.5 A load

Estimated end voltage

23.06 V0.94 V / 3.9% drop
03

Artwork wallwashers

Cover the complete artwork with light.

Assumes standard wallwashers with close-overlap spacing for smooth, uniform artwork lighting; verify final spacing with the selected fixture’s IES file.

Assumed distribution: standard wallwasher. Distance is prefilled from the suggested starting point; edit it to match your installation.

Recommended wallwashers

3 fixturesUsing 6.0 ft distance · very uniform overlap · 2.0 ft centers · first aim 1.0 ft from edge

Suggested fixture-to-art distance

6.0 ftStandard wallwasher starting point · verify selected IES file
04

Chandelier size

Check chandelier scale against the room.

A common room-based sizing rule for a first design conversation.

Uses the room length and width entered in the lumen calculator above.

Suggested diameter

42 inConfirm table size, ceiling height, and fixture proportions before specification
05

IES Photometric Studio

Inspect real fixture photometry.

Upload an IES file to review polar distribution, iso-illuminance, BUG rating, beam geometry, and fixture data in one browser-based tool.

Professional photometric tool

Open IES Studio Upload · inspect · adjust · export

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Need results you can submit or build from?

Free tools help with early planning. A professional photometric plan verifies real fixture performance, uniformity, glare, spill light, and project requirements.

Request a photometric plan