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About LTI Optics

A focus on lighting since 1982

LTI Optics is a fully independent company committed to enhancing and supporting the industry's leading optical design software, Photopia, as well as providing optical design services to the lighting industry. LTI Optics, LLC was a spin-off from Lighting Technologies, Inc. (LTI) when Lighting Technologies was sold to Musco Sports Lighting in 2006. LTI Optics was spun off to continue the independent optical design software and consulting portion of LTI.

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Optical Design Software

LTI Optics has a long history of optical design software. We pride ourselves on the accuracy and ease of use of our software.


Photopia for SOLIDWORKS

Optical Design Consulting

With over 50 years of experience on thousands of projects, we have the expertise and resources to solve your most complex optical design problems.

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Lamp and Material Measurements

For accurate raytracing software, accurate lamp and material models are a requirement. With over 30 years of experience we've mastered the art and science of characterizing lamps and materials for raytracing..

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Mark Jongewaard President, Photopia Product Manager, Senior Optical Engineer

Mark has worked at Lighting Technologies since 1989 and was one of its owners before the sale to Musco. Mark was in charge of the optical related business at Lighting Technologies and is continuing this work in partnership with Ryan Kelley as owners of LTI Optics. Mark holds a bachelors in architectural engineering from the University of Colorado as well as a masters in civil engineering. Both degrees have an emphasis in illumination. Mark also maintains a close relationship with the lighting program at the University of Colorado, teaching a full semester course on optical design as well as being a board member and instructor for the Rocky Mountain Lighting Academy. Mark has completed optical projects for hundreds of customers, resulting in 10 granted and 9 pending US Patents. Outside of work, Mark enjoys skiing, mountain & road biking and traveling.

Ryan Kelley Vice President, Photopia Product Support, Senior Optical Engineer

Ryan went to the University of Colorado - Boulder and studied Architectural Engineering with a focus on Lighting, in which he has both BS and MS degrees. After a summer internship at Cooper Lighting in Georgia that involved getting a golf cart stuck on the first day, he returned to Colorado and joined LTI after graduation in May of 2006, just as LTI Optics was being created. Ryan focuses on optical design, completing designs for hundreds of clients around the globe, resulting in 11 granted and 15 pending US patents. Outside of the office Ryan enjoys road biking, skiing, camping and hiking.

NIST - IUVA Workshop

  • Kelley, Ryan (January 2020). "Simulating the Performance of UV Systems". NIST IUVA Workshop on Ultraviolet Disinfection Technologies & Healthcare Associated Infections: Defining Standards and Metrology Needs 
    • Photopia 2017 October 2017
      Full support for anisotropic transmissive materials using our new high resolution BSDF measurement machine, and the beginning of an entirely new, vector based plotting system for data output, along with support for local languages in SOLIDWORKS.
    • Photopia for SOLIDWORKS PODT May 2016
      The first optical software with optical design tools that operate directly inside of SOLIDWORKS.
    • Photopia 2015 August 2015
      Color material support and raytraces in energy units like watts and PAR for horticulture.
    • Photopia for SOLIDWORKS December 2014
      All of Photopia, inside of SOLIDWORKS to save time. Our first integration in a 3rd party CAD package.
    • Photopia 2014 July 2014
      A completely rewritten raytracing engine enables multithreaded raytraces, spectral raytraces, and optimizes LED arrays, resulting in an up to 50X speed increase.
    • Photopia 3.1 2010
      New Parametric Refractor Design Tools for designing lens optics, which are more commonly used with LEDs and thus gaining popularity and feasibility.
    • Photopia 3 2008
      Major improvements to CAD system, as well as support for anisotropic materials and scripting.
    • LTI Optics formed 2007
      LTI Optics was spun off from Lighting Technologies when it was purchased by Musco Sports Lighting. LTI Optics is an independent business to focus on Photopia and optical design services.
    • LTI Sold 2006
      LTI is sold to Musco Sports Lighting, a customer of LTI's custom software services, in order to focus on in-house software development for Musco.
    • Photopia 2.0 Released 2000
      Optimized raytracer allowing for larger models and speed improvements up to 50X faster. Introduction of the Parametric Optical Design Tools for reflector optics, radically decreasing optical design development times.
    • Simply Series Released 1997
      LTI released the Simply Lighting Series of products. These were smaller scoped applications that allowed for the quick design of several types of lighting systems.
    • Photopia Released 1996
      Photopia replaces FiELD as our luminaire design and analysis software. Photopia is based on non-sequential 3D probabilistic raytracing and oriented toward non-imaging optical systems.
    • Custom Software 1994
      LTI begins developing custom versions of its lighting design software for various manufacturers around the world to use internally and distribute to customers with a database of their products.
    • FiELD Released 1987
      New software for designing luminaire optical systems, based on non-diffuse radiative transfer methods.
    • BFDF/BTDF Device 1987
      LTI builds a custom measurement device to develop a material scattering library for FiELD. This begins a nearly 30 year history of material measurements.
    • Lumen-Micro Released 1982
      Lumen-Micro is one of the first lighting analysis programs available on the personal computer, enabling small lighting design firms who didn't have access to the large mainframes to perform lighting calculations of their own.
    • Lighting Technologies Founded 1982
      LTI was founded in Boulder Colorado.

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    Copyright 2020 by LTI Optics, LLC, all rights reserved.

    SOLIDWORKS® is a registered trademark of Dassault Systémes SOLIDWORKS Corporation.

    LTI Optics provides Photopia, the industries leading optical design software and optical analysis software for designing and analyzing illumination optical systems. Photopia optical design software works alone or is an add-in to SOLIDWORKS, allowing full opto-mechanical integration.

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