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IES LDT
File conversion

Convert IES to LDT

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Is it possible to convert IES to LDT?
Yes - IES converts to LDT.

LDT (EULUMDAT) is the European photometric format carrying the same physical data in a different layout. IES<->LDT is a genuine, common conversion handled by IESviewer, photometric toolboxes, and online converters. Top db conversion - strong in-house candidate.

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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How to convert IES to LDT

Converting a .IES file to .LDT lets you open the content in software that prefers the .LDT format, though some details may change compared with the original. The programs listed below open .IES files and can save or export them to .LDT (or a closely related format). One of them is ZEMAX: ZEMAX is optical design software used by engineers and scientists to model and analyze optical systems such as lenses, cameras, and illumination systems.….

A full step-by-step guide for this conversion is on the way; the information above is drawn straight from our database.

Programs that convert IES

ZEMAX
EulumdatTools
LITESTAR 4D Photoview
IES to EULUMDAT Converter

About these formats

.IES IESNA Photometric Data File

An IES file is a plain-text photometric data file that maps a light fixture's luminous intensity across every angle. Lighting designers open it in tools like Dialux or AGi32 for illuminance…

Open .IES details →
.LDT EULUMDAT Photometric Data File

An LDT file is a EULUMDAT photometric data file - plain text that describes how one light fixture distributes its light in every direction. Open it in DIALux, Relux, or IESviewer to run…

Open .LDT details →