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LDT IES
File conversion

Convert LDT to IES

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

IES (ANSI/IES LM-63) is the North American photometric format carrying the same physical data in a different layout. LDT<->IES is a genuine, common conversion handled by IESviewer, photometric toolboxes and online converters. This is the top and only real LDT conversion - strong in-house converter candidate.

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Tested on macOS, Windows & Linux
Last verified Sep 2026

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How to convert LDT to IES

Converting a .LDT file to .IES lets you open the content in software that prefers the .IES format, though some details may change compared with the original. The programs listed below open .LDT files and can save or export them to .IES (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 LDT

ZEMAX
LITESTAR 4D Photoview
EulumdatTools
IES to EULUMDAT Converter

About these formats

.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 →
.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 →