||Through a joint co-operation between Hong-Kong based Tungda Lighting and the R&D Centre they established at Fudan University's famous Department of Light Sources in Shanghai, this is the first commercial induction lamp to have emerged from China.
Fudan University made great progress in such lamps more than 30 years ago, but it is only very recently that the design has been brought to a state suitable for mass production. This lamp is manufactured along the lines of the Philips QL competitive product, but Tungda has made a number of external modifications. Most noticeable is the use of the E40s screw base. This allows the lamp to be installed in luminaires designed for high wattage incandescent or HID lamps with the minimum change required. A special heat-sinking arrangement is employed within this over-sized base to enable the lamp to maintain good luminous efficacy.
In addition to this lamp, the first of a range of 23W to 200W products, Tungda also offers a number of similar lamps having an integrated electronic ballast in the base. The lifetime is reduced to approximately 30,000 hours for those types owing to the higher operating temperature of the electronic control gear. But its low price and simple package makes it a most attractive replacement for high wattage incandescent lamps. Also the manufacturer argues that since the internal power coupling antenna and the ballast should be replaced when the glass discharge vessel fails, it makes sense to provide everything in one single easy to change unit. It should be noted that this early prototype does not offer full EMC shielding, however this problem has been successfully addressed in current production lamps.