Skip to main content

DIALux is free and open. Two things our users love.


We believe that professional lighting design should be possible without 1.000€+ CAD-software. Anyone can download DIALux for free and use it for personal, educational, and commercial purposes.

With DIALux, we offer you a powerful and comprehensive planning tool that provides you with all the necessary functions for professional lighting design free of charge. We know this is not common and answer a few obvious questions:

How do you fund the development of DIALux?


The development of DIALux is funded by membership fees from luminaire manufacturers, our DIALux members. We cooperate with all leading brands in the lighting industry. As DIALux members, manufacturers can make their brand visible in DIALux and their products available for planning. Only DIALux members, for example, can offer advanced product data like 3D models, inform you about updates in the news feed or can receive product inquiries from you directly from DIALux.

Does DIALux only allow using data/products from DIALux members?


The main purpose of DIALux is to provide the best possible support for the lighting designer in his daily work. We believe in openness and accessibility as central values of DIALux. DIALux is accessible to everyone. Whether student or professional, whether with a technical or a design background. It is available all over the world. In 25 languages, with regional and international standards included, supporting small and large manufacturers. Open is better. Always.

Therefore DIALux is open to standard photometric file formats like EULUMDAT *.ldt or *.ies. You can import any file or luminaire you want into DIALux and do your calculations. However, there needs to be a difference between members, who are supporting the development of DIALux, and non-members. Non-members, for example, cannot show their brand/logo and brand name in DIALux. You may have recognized the message “This manufacturer is not yet a DIALux member” while working with luminaires or the label “Not yet a DIALux member” in PDF reports. Non-members also cannot offer advanced product data, send news updates or receive user inquiries.

You represent a lighting brand and want to be visible in DIALux? Great! This way please: How to become a DIALux member.

Do you sell my personal data?


Absolutely not. We know that this is a common scheme to make money these days. Our business model is simple; we collect membership fees and usage-based fees from manufacturers and sell Pro Features to users. That are the only ways we make money. We won’t sell your personal data to anybody. Ever.

Why has DIALux introduced Pro Features?


With DIALux evo 9, we have introduced extensions for special users or applications, so-called "DIALux Pro Features". These allow, for example, workflows for large planning departments to be optimised by tailoring DIALux documentations 100 % to the corporate design of the company. DIALux Pro Features are very useful to a small and specific group of power users. Not so much to users who run DIALux only occasionally. Hence we decided to make our Pro Features available in a monthly subscription. You pick what you need.

How can I support DIALux as a user?


We’re glad you‘ve asked. DIALux development takes a lot of time, money and hard work. You can support DIALux by using products and data from DIALux members. We cooperate with all leading brands worldwide, almost 200 at this point (you can find all the latest DIALux product catalogues here). By doing so you provide important feedback to manufacturers, that they are investing into a vibrant and active planners community. Moreover, if our Pro Features help you to do your job, we are more than happy if you buy a subscription. Thank you for supporting us!