iesdesk Beta
Sign in Sign up

What's new

IESDesk is in beta and changes every week. Here is every release, newest first.

Live now: version 0.20.0, released . 16 releases since 28 September 2026. Follow them with the Atom feed.

On this page

Version 0.20.0 Live now

New

  • Compare shows 2 or 3 IES or LDT files side by side, with a table of figures and two polar diagrams on one scale. IESDesk keeps no copy of the files.
  • Compare warns you when an IES file may face another direction than the other files. It also shows the field angle next to the beam angle.
  • The What's new page lists every release of IESDesk, newest first.

Improved

  • You can drop a file on each one-file tool: IES View, LDT View, Diagrams, Report sheets, ULOR, BUG Rating and UGR Table. Compare takes 2 or 3 dropped files. A warning tells you why a drop is refused.
  • When you are signed in, the home page still shows, with a "Your files" button.
  • The export check is faster: 500 edited files take 5 seconds, not 7.

Version 0.19.0

Improved

  • The examples on the Diagrams page and the Features page also show the beam look of the cone diagram.

Version 0.18.0

Improved

  • The dark theme is easier to read in the edit grid, the dialogs, the 3D view, Your files and the Learn pages.
  • The error pages follow your choice of the light or the dark theme.
  • The Account page shows your account and your report sheet branding. The other account links are in the top menu.
  • On a phone, the result tables of ULOR, BUG Rating and Report sheets jobs scroll sideways, so each row stays short.

Fixed

  • The 3D view keeps drawing on a busy phone that scrolls while the page loads.
  • A limit of one now reads "1 file" and "1 job", not "1 files" and "1 jobs".

Version 0.17.0

New

  • One top menu on every page holds Features, Tools, Learn and, after you sign in, Your files.
  • A switch in the top menu changes the theme to light or dark. The browser keeps your choice.
  • Your files lists every batch and every job in one place, newest first, with the next step on each row. It is the first page after you sign in.
  • One Edit upload takes IES and LDT files in one drop and makes one batch for each format. The Diagrams upload does the same.
  • The public Edit pages for IES and LDT files explain bulk editing before you sign up.
  • The Diagrams page shows one small example of each diagram.
  • The UGR Table warns you when a luminaire is symmetric in one direction only.

Improved

  • Each tool has one name in the top menu, the page headings and the browser tabs.
  • IES View and LDT View each open both formats.
  • On Report sheets, you choose the sheet type: Area and road, Floodlight or Indoor. A sample sheet of each type opens in one click.
  • The beam look of the cone diagram draws beams up to 60 degrees, not 45.
  • The "Made with IESDesk" line on a report sheet links to iesdesk.com.

Fixed

  • IESDesk refuses a file with an impossible candela value or angle, and tells you why. Before, some pages showed an error page.
  • The Learn pages cite the correct sections of CIE 121 for the length of an LDT luminaire.

Version 0.16.0

New

  • The cone diagram has a beam look for spotlights. It shows the beam from the side, with each value in metres and feet. Choose it with "Cone look" on IES View, LDT View and Diagrams.

Fixed

  • The UGR Table refuses a damaged file with a clear message. Before, some damaged files gave a wrong table.

Version 0.15.0

New

  • The UGR Table shows the standard UGR table of one IES or LDT file, by the CIE 117 tabular method. IESDesk keeps no copy of the file.
  • IES View and LDT View show a Summary card. It gives the light output, the power, the efficacy, the peak intensity, the light-emitting area and the symmetry.

Version 0.13.0

New

  • Report sheets makes a one-page PDF report sheet for one IES or LDT file, in A4 or Letter. IESDesk keeps no copy of the file.
  • With a free account, you make report sheets for up to 100 files in one job. You get one ZIP file, and an email when it is ready.
  • Your logo, your name and a footer line can go on your report sheets. Add them on the Account page.
  • A batch makes report sheets from your edited files.
  • IES View and LDT View show the light in 3D. Real light shows the lit floor, and False colour shows the strength of the light. Point at a direction to read its candela value.
  • A diagram job can send you an email when the diagrams are ready.
  • The Features page explains each feature and links to each tool.

Improved

  • Learn in the top menu opens a list of every guide, and each guide lists its sections.

Version 0.12.1

Improved

  • On a phone, the list of sections of the privacy notice and the beta terms is easier to use.

Version 0.12.0

New

  • Diagrams draws the polar, Cartesian, cone and isolux diagrams of one IES or LDT file. IESDesk keeps no copy of the file.
  • Each one-file tool shows how to do the same work for many files with a free account.
  • The privacy notice and the beta terms list their sections, so you can go straight to one.

Improved

  • The top menu lists the free tools.
  • The text pages have less empty space between headings and text.

Version 0.11.0

Improved

  • The Learn pages read as one article, with less empty space between chapters.
  • The About, Contact, privacy and terms pages keep their text in one column with a comfortable line length.
  • The footer links to Emre Güneş on LinkedIn.

Version 0.10.0

Improved

  • Every public page gets a new top menu and footer. On a phone or a tablet, the menu opens in a side panel.
  • The privacy notice names our new uptime monitor.

Version 0.9.1

Improved

Version 0.9.0

New

  • A new home page shows what is free with and without an account, with a real polar diagram and a form for product news.

Improved

  • Each error page says what happened and gives one next step and our contact address.
  • A "Beta" label sits next to the logo on every page.

Version 0.8.0

New

  • IESDesk publishes its privacy notice and its beta terms.
  • The diagram theme editor explains each field. A numbered key shows which part of the diagram a field changes, and the preview draws again after each change.
  • The theme editor shows each diagram on its own tab, and "Save as new theme" makes a copy of a theme.
  • A link to IESDesk on LinkedIn, X or a chat app shows a large preview picture.

Fixed

  • Edit no longer offers to add an IES [MORE] line to a file that has none.

Version 0.7.0

New

  • The About page tells who built IESDesk, and why.
  • Each bulk upload takes a folder and its subfolders. Before the upload starts, a warning names each file that it leaves out.

Improved

  • A diagram job that skipped some diagrams, such as a cone for a wide light, reads "Completed" with the number of skipped diagrams.

Version 0.6.0

New

  • This is the first release of IESDesk on iesdesk.com.
  • Edit changes the metadata of hundreds of IES and LDT files at once. You download the edited files in one ZIP file.
  • You can also edit the metadata in a spreadsheet. Download it as a CSV or Excel file, change it in any program, and upload it again.
  • IES View and LDT View open one file and draw its four diagrams.
  • With a free account, Diagrams draws polar, Cartesian, cone and isolux diagrams for many files in your own theme, in one ZIP file.
  • BUG Rating and ULOR are free for one file. With a free account, each one takes up to 500 files in one job and gives you one CSV file.
  • Learn explains IES and LDT files, their fields and the diagrams.