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 1 T5 Lamps and Luminaires – The 3 rd  Generation in Office Lighting Ir Martin WU Kwok-tin Building Services Engineer, Energy Efficiency Office, EMSD Abstract: Hong Kong is a leading commercial and financial centre in Asia and the energy consumption is increasing substantially every year over the past ten years. The electricity consumption in the commercial sector is increasing at about 7% per annum and is the fastest growing sector. The Energy Efficiency Office of Electrical and Mechanical Services Department is actively exploring means to reduce energy consumption and a series of initiatives are being implemented to achieve the goal. One of the initiatives is to investigate advance and innovative energy saving technologies with a view to promote the wider use of these technologies in Government buildings. The investigation covers equipment for lighting, air conditioning, lifts and escalators. The paper will present a report of the technical  background, the current status of our findings and our future research interests in office lighting using T5 lamps. Keywords : Fluorescent Lamps; Ballasts; T5 Lamps & Luminaires; Pilot Project, Prospect 1. Introduction The Energy Efficiency Office (EEO) of the Electrical & Mechanical Services Department (EMSD) has committed to use energy efficient lamps and luminaires for lighting installations for their Pilot Energy Management Opportunity (EMO) Implementation projects. The aim of this study is to investigate the feasibility of adopting the new generation of T5 (16mm dia.) fluorescent tubes together with appropriate electronic ballasts for use in fluorescent luminaires. The very small dimensions and weight of T5 lamps offer greater opportunities for luminaire design. The investigation will focus on the merits and demerits of luminaires with T5 lamps against those with conventional T8 or T12 lamps. All relevant background information and technical details of the new lamp type, electronic ballasts for the new lamps and the new luminaires design will be discussed in the paper. The results of one of our pilot projects using T5 luminaires will also be included. 2. Technical Information The basic operating principle of fluorescent lamps and their associate control gears will briefly be introduced in this section. 2.1 Fluorescent Lamps The fluorescent lamp, or low-pressure mercury vapour lamp, is by far the most widespread of all discharge lamp type used for general lighting nowadays. It is employed almost universally especially in office lighting. The introduction of

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