DIALux
Professional lighting design software
About
DIALux is the global standard lighting design software from Germany's DIAL GmbH, in development since 1994 and free to use in 26 languages. It plans, calculates, and visualizes indoor and outdoor lighting with real luminaires from 450+ manufacturers — the company reports 750,000 professional users and 900,000 planned projects per month. The April 2026 DIALux evo 14 release added room-by-room calculation and a Revit bridge for BIM workflows. It is a calculation-first professional tool rather than an AI product, so expect depth and a learning curve rather than automation.
What it can do
- Indoor and outdoor lighting calculation
- 1.9M luminaires from 450+ manufacturers
- Room-by-room calculation (evo 14)
- IFC and Revit BIM workflows
- Emergency lighting planning
Setup
- Visit https://www.dialux.com
- Download DIALux evo free of charge
- Build or import your room geometry
- Place luminaires and run calculations
Prerequisites
Windows PC; free download
Use cases
Works with
Trust score — 8/10
Scored 8/10 (verified tier, metrics-v1). Evidence: Official site (dialux.com) documents 750,000 users, 26 languages, 450+ luminaire manufacturers, and the free evo 14 release (April 2026); Revit/IFC BIM workflows and room-by-room calculation corroborated by vendor press releases; Calculation-first professional tool — entry does not claim AI capabilities the vendor does not advertise. Manual review: entry checked; vendor scale stats kept as company-reported. License: Free to use; commercial lighting design software.
How the trust score is built
Full methodology →- Adoption · stars/downloads, log-scaled vs peers
- 9.0/10
- Maintenance · recency, releases, issue load
- 8.0/10
- Openness · license + docs
- 8.0/10
- Manual review · sanity read + red-flag check
- 8.0/10
- · Official site (dialux.com) documents 750,000 users, 26 languages, 450+ luminaire manufacturers, and the free evo 14 release (April 2026)
- · Revit/IFC BIM workflows and room-by-room calculation corroborated by vendor press releases
- · Calculation-first professional tool — entry does not claim AI capabilities the vendor does not advertise
- · manual review: entry checked; vendor scale stats kept as company-reported
Sources
Every fact above was checked against these sources. Where a claim comes from the provider and couldn't be independently verified, the text says so.