Hi Mathews Pulican I am once again troubling you and this time on topic of "FLICKERING LED STREET LAMPS" Our local Govt of Goa has decided to get away all the street lighting of sodium and other type of bulbs for illumination on roads in whole of Goa by replacing with LED lights. It appears to be quite a gigantic move. I do not know its cost , size and other details of these LED lights while tendering being done.. The Goa Electricity Dept have already installed in some areas in Goa. I have found that some street LED lamps were flickering and others in that same row were stable. . The supply of 220 volts, 50 Hz appears to be stable and I can't expect lose connection either, as other lamps are working well. Only left to be seen, whether they are of substandard supply against the tender/order , and its cost. I am in the view that these LED lamps could have some technical problem because of flickering problems. . I have isolated the low voltage , loose connection ( no sparking taking place) and only left for me to be seen is whether they are ISO/ISI mark. If there is something wrong procedure followed during procurement then it is going to be a big scam. Let me keep fingers crossed and be on positive thinking and I am not going to jump into conclusion. Can you explain the causes of flickering on technical point of view and let us isolate loose connection and low voltage. I have something to tell you whether there is a necessity of drivers for LED's especially on high frequency i.e 100 to 150 Hz ( low freq. is 7 to 70 Hz) to avoid flickering? It seems that retina is able to resolve light flickering at 100 to 150 HZ and may affect the brain cells. Is that true? Also can trigger ailments as serious as epileptic seizures. For long term exposure to high frequency in the range can also cause malaise, headaches and visual impairment. Please let me as you are an expert in this field of electrical engineering about this concept also. Your feedback may be useful to us so that I can recommend further purchases or advice what exactly to be done while tendering and also whether you feel an insurance is recommended after the warranty expires? . Let me know the procedure to check the LED street lights? I know that we cannot use a multimeter for checking these types of LED bulbs but can you recommend any professional test instruments? I was told a repeat order is likely to be placed to the same firm in bulk, or may be there is change in specification after knowing these symptoms? I need to check. Please reply quickly all my above queries, so that Government of Goa can be advised for further complications if any, and its cost factor which may run in several crores if there is a failure of wrong supply and working of LED's. ANY KNOWLEDGEABLE PERSON CAN GIVE THEIR FEEDBACK ON PUBLIC INTEREST.
Stephen Dias Dona Paula
