| 摘要 |
An LED lamp device (100) comprises: a supply section (110) having input terminals (104, 105, 106, 107) for connecting to output terminals of a TL ballast (3) and having output terminals (108, 109); at least two lighting strings (121, 122), each lighting string being coupled in series with a dedicated controllable switch (S1, S2), wherein the series arrangements of lighting strings and switches are connected in parallel to said output terminals (108, 09); a control circuit (150) for controlling the controllable switches (S1, S2); wherein the control circuit is adapted to control the switches to be successively ON and OFF so as to make each string sequentially output light, wherein a next switch in succession is switched ON before the corresponding previous switch is switched OFF such as to assure an overlap between successive ON periods of different switches. |
