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Short Literature Review on T5 lighting system

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Capstone, T5, EMF
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  Based on the United State Patent document, “Light fittings for retrofitting large-diameter inductive fluorescent lamps to smaller-diameter electronic T5- lamps” invented by Walter Holzer, there are fluorescent lights or tubes available in different lengths and diameters. “T” number is used to label the diameter of the tube where each single unit of T representing a value of 1/8 inches. In other words, T5 lamps are having 5/8 inches of diameter. Those tubes with large diameter are gradually being replaced by smaller tubes such as T5 tubes. This is because the newer tube can reduce up to 40% of electricity consumption as compared to the T8 lamps. According to the article written by S.Y. (Ron) Hui, D.Y. Lin, W.M. Ng and Wei Yan, with title “Class -A2 ultra-low-loss magnetic ballast for T5 fluorescent lamps  –  A new trend for sustainable lighting technology”, it mention that some T5 lamps are having improved version of phosphor coating which can prevent mercury from being absorbed into the phosphor and bulb glass. This results in where T5 lamps will have less impact on global environment as compare with T8 lamps. T5 lamps also said to have same color temperature standard where users will not have to worry about the mismatch of color in future lamp replacement. As describe in this article, electronic ballasts were designed to run the T5 lamps by using the resonant tanks in generating high-ignition voltage for the lamps and in the same time, magnetic ballasts were thought to be not suitable in driving T5 lamps which needed high voltage. Challenges in developing magnetic ballast are describe in the table below and in accordance with the methods to fulfill the condition. Table 1: Challenges in using magnetic ballast for T5 lamps. Challenges Way to encounter Sufficient ignition voltage Applying electronic starter (developed in 1990s for T8 lamps) for T5 lamps End of life detection for aged/faulty lamps Provision of high-lamp voltage to sustain the lamp arc after lamp ignition Using LC ballast where long lifetime is expected and the iron core and copper winding for inductor can be recycled. Less ballast loss than the electronic counterparts Based on next tables, magnetic ballasts are more efficient than electronic ballasts.  Table 2: Initial assessment of loss components. Lamp Type T8 36W T5 28W Rated Voltage (Vrms) 103 167 Rated Current (Arms) 0.44 0.175 Conduction loss (i 2 R) 100% 16% Core loss ( ∝   ) 100% 40% References 1.   Holzer, W. (2003). U.S. Patent No. 6,624,554 . Washington, DC: U.S. Patent and Trademark Office. 2.   Hui, S. R., Lin, D. Y., Ng, W. M., & Yan, W. (2011). A “Class - A2” Ultra -Low-Loss Magnetic Ballast for T5 Fluorescent Lamps — A New Trend for Sustainable Lighting Technology. Power Electronics, IEEE Transactions on , 26 (2), 622-629. 

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Jul 23, 2017

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Jul 23, 2017
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