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.
Room lighting calculator
Estimate light output and a first-pass ceiling grid.
Room & fixture settings
Uses HB150EE4M-PYS-90D IES photometry. Changing lumens scales this fixture’s distribution; it does not model a different optic. Empty rectangular room with diffuse surfaces and a flat ceiling. Results are approximate.
Manual grid counts override target-based sizing. Omitted positions start at the bottom-right of the preview. Your reference has 90 fixtures in 91 positions; the exact missing position is not confirmed.
Estimated maintained average
—Calculating…Total fixture lumens
— Calculating…Suggested fixture quantity
— Calculating…Suggested grid
— Calculating…Grid spacing X / Y
— Calculating…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 loadEstimated end voltage
23.06 V0.94 V / 3.9% dropArtwork 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 edgeSuggested fixture-to-art distance
6.0 ftStandard wallwasher starting point · verify selected IES fileChandelier 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 specificationIES 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 →Start a project
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