How Photometry & IES Files Work in VibeLux

Import manufacturer photometric data (IES/LDT) to drive accurate PPFD, uniformity, and lighting analysis in the AI Designer and calculators.

Workflow overview

Bring real photometry into designs and calculations.

Pro plan: advanced IES comparison, reporting, and exports

Download LM-63 (IES) or LDT file from the manufacturer

Use IES Manager to import and check candela data

Place fixtures; PPFD engine uses IES distributions

Compare distributions, run maps, export reports

• IES LM-63 photometric files (commonly .ies)

• EULUMDAT (.ldt) where provided by some vendors

• Parsed data: candela distribution, vertical/horizontal angles, tilt, lumens

• Open IES Manager in the Designer to upload files

• Automatic schema checks and metadata extraction

• Visual check of distribution; compare multiple files

• PPFD engine reads IES candela tables per angle

• Improves accuracy of maps, average PPFD, uniformity

• Falls back to beam angle/PPF if no IES data present

• Use manufacturer IES from the exact SKU/optic

• Verify mounting height and tilt match the design

• Compare multiple IES files when selecting fixtures

• For missing IES, request from vendor or use library default

• AI Designer for placement, PPFD, and uniformity

• PPFD Map and Coverage Area calculators

• Electrical estimator and panel schedules (indirect)

What if my fixture has no IES file?

You can still design using nominal PPF/beam angle. Accuracy improves when an IES is provided.

Do you support LDT?

Yes, where provided. Some vendors prefer LDT; we parse standard fields and convert to our internal format.

How is IES used in PPFD?

We sample candela distribution over angle to weight intensity at each canopy point, improving min/avg metrics.

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