# Eulumdat

> Eulumdat (iPhone/iPad app by Holger Trahe.)

- Source: https://appshunter.io/ios/app/eulumdat/id6756174085 (this page in markdown: same URL + `.md`)
- Developer: [Holger Trahe](https://appshunter.io/developer/1687929013)
- Category: Utilities, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 16.0 · 2 MB
- Languages: American English
- Released: 2025-12-08
- Data updated: 2026-05-17
- User reviews in markdown: https://appshunter.io/ios/app/eulumdat/id6756174085/reviews.md

## What is Eulumdat?

Eulumdat is a professional photometric data viewer for lighting engineers, designers, and
  architects. View and analyze LDT (EULUMDAT) and IES photometric files with beautiful interactive
  diagrams.

  Features:
  • Open and view LDT and IES photometric files
  • Multiple diagram types: Polar, Cartesian, Butterfly, Heatmap, BUG Rating, and LCS
  • Interactive 3D butterfly diagram visualization
  • Export diagrams to SVG
  • Convert between LDT and IES formats
  • Batch conversion support
  • Dark and light theme support
  • QuickLook preview integration (macOS)

  Perfect for:
  • Lighting designers reviewing luminaire data
  • Architects evaluating lighting fixtures
  • Engineers analyzing photometric distributions
  • Anyone working with lighting specification files


## Version history (last 1 release)

### 1.0 — 2025-12-08

No release notes.

## More apps by Holger Trahe

- [RoomPlanSimple](https://appshunter.io/ios/app/roomplansimple/id6449182214)
- [GLDF Viewer](https://appshunter.io/ios/app/gldf-viewer/id6755966812)
- [GeoDB-rs](https://appshunter.io/ios/app/geodb-rs/id6755972245)

All apps by Holger Trahe: https://appshunter.io/developer/1687929013

## Related topics

[eulumdat](https://appshunter.io/ios/topics/eulumdat)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-17.*