Volume 6 Issue 1
July 2002    


This publication answers commonly asked questions about T5 systems, including T5 lamps, ballasts, and luminaires. Lighting Answers: T5 Fluorescent Systems contains three parts: physical characteristics, economic issues, and design and application. The first section, physical characteristics, addresses questions on dimensions and performance of lamps, ballast, and luminaire performance. The second section, economic issues, focuses on the monetary benefits of T5 systems. The third section, design and application, discusses proper applications of T5 lamps and the advantages and disadvantages of T5 systems versus T8 systems in lighting design.


The T5 lamp is an increasingly popular development in fluorescent lighting. In 1995, T5 fluorescent lamps entered the market in the United States. Today, the three major lamps manufacturers aggressively market T5 lamps. Luminaire manufacturers create innovatively designed compact luminaires using up-to-date optical materials. Recently, lighting designers have begun to specify such T5 luminaires for high-end new construction. The marketing and innovative design of T5 systems have left many end users wondering whether they should consider T5 luminaires instead of T8 luminaires, especially in new construction and retrofitting of T12 magnetic systems. End users are confused by the 10°C (18°F) difference in optimal temperature and the small difference in system efficacy between T5 and T8 systems. This section focuses on physical characteristics of T5 systems compared to T8 systems. This publication discusses T5 systems—including T5 lamps, ballasts, and luminaires—to answer commonly asked questions.


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