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New York City Street Lights To Go LED
eldavojohn writes "Wired has a short piece on NYC's new street light project. I don't think we need to belabor the many benefits that LEDs hold over traditional light bulbs, but the finishing touches are being addressed, and they will hopefully be put into place sometime next year. This design won a competition back in 2004, and OVI has been whittling down the prototypes. At $1.175 million, this sounds like a pretty cheap deal considering the DOE forked over $21 million to 13 R&D projects along the same lines."
'say they can hear LCD flat panel displays making a buzzing noise'
Yeah, I can hear that, and its not what you think. Its usually a transformer charging up or some other form of high-voltage circuit. When we used to have a 36 inch CRT tv, I could hear it on across the house and 2 floors away cause of that damned buzz. Now we have some widescreen (tube tv blew cause of brownout and wasnt surge protected) which I can only hear faintly in the next room..
The tubes also were lower frequency. The recent LCD's are more of a quick crackle and gone.. Perhaps its just too high for me to hear.
There is PWM due to the tail lights being dimmer when your not braking.
Again, PWM is usually around the 200khz mark though.
People who see flicker with it are just seeing it because they want to - its all in their head.