Luminaire Testing Laboratory, Inc. (LTL) is an independent source of photometric test reports for the lighting industry. In addition to producing Roadway, Floodlight, and indoor Photometric Test Reports, LTL also performs ballast characteristic testing, electrical system testing, mining vehicle luminaire testing, and absolute photometric testing. LTL uses two computer controlled, Type C, swinging mirror goniophotometers to test luminaires. Test reports conform to Illuminating Engineering Society of North America (IESNA) standards.

The lab was established in 1989 in Allentown, PA because of its accessibility to transportation and distribution. Through the years, LTL has earned a reputation for producing highly accurate photometric test reports in a time frame that fits today's high-speed marketplace. All test reports since 2000 are archived electronically to allow for instant email transfer of test reports. Through the use of the most recent technology we can offer high speed delivery while continuing to serve our customers with the same high quality service we have provided in the past.

Tours of LTL are welcomed and encouraged.