Light Sources for Fiber Optic Applications FTI designs and manufactures a family of Light Sources specifically designed for fiber optic lighting. All are state-of-the-art, conforming with the latest CSA or ETL and CE certifications. Our Quartz Halogen light source models, valued for uniform output and inexpensive replacement lamp, and our more recent HID and Xenon offerings are available from stock. For more than 30 years, FTI's FO series light source has been the market's choice for dependable fiber optic lighting at a cost efficient price point.