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March 19, 2011



I'm not sure what to think. I put in two Philips 8 watt LEDs into my garage door opener (standard base). My remote door opener wouldn't work. I took me a week to realize what the problem was. Once I replaced the LED bulbs, the remote worked fine. I put in the LEDs and again the remote wouldn't work! Who knew?



I installed led lights and have the same problem. Cb has so much noise I cant use it. Also noticed fm radio channel 93.1 all static yet channel 96.6 no problem. Didnt bother to check anymore channels

Bob Bramel

Hi! Is this blog still active? I've encountered an LED lighting problem with my iPhone 4 and wife's 4s. I've been installing R30 type LED bulbs as money allows into 25 or so recessed canisters in my house. Yesterday I installed 8 Sylvania floods and this morning neither phone could maintain a connection for more than 20 seconds. I tried more than 15 times, but every time the call got dropped. Signal strength in the house is good, yet the effect lasts no matter which room I'm in. With the lights out the problem goes away. Neither Apple or AT&T acknowledges knowing of any problem. I've emailed Sylvania. A similar number of Philips R30 LEDs don't seem to cause this problem.

Jenee R

Similar problem here. Installed 3 LEDs (UtilaTech) in our kitchen canister fixtures, and with the lights on, I cannot listen to NPR! What a shame! In addition, we just purchased a new refrigerator with LEDs and every time we open the door, there is interference with the FM signal as well. Any helfpul info would be greatly appreciated.

Myles Powers

I just install a DoctorLED map light at the nav station on my sailboat. It produces a lot of RF noise on most FM bands. Makes it pretty useless. I'm checking with them to see if they can send a replacement....


CFL (Compact fluorescent Light) has the same problem, but it is limited to the HF band to about thirty megahertz as it is an arc current that generates a broad band radio frequency in the same way as lightning.

To make the LED (Light Emitting Diode) more efficient, it is turned off for the majority of a cycle and is pulse modulated up to the gigahertz range. The eye's retentivity does not see it flashing if the frequency is high enough and it seems that the higher the frequency of the pulses, the more efficient the LED becomes. This means that any device that needs to receive a radio signal to function will be overwhelmed by the LED. This effect has been known as front end overload and is similar to another transmitter transmitting at or near your receive frequency and overwhelming any other signals, especially the signals you need to receive.

This can only work if a specific frequency is used and the bandwidth is limited to some tolerance in relation to the frequency chosen. As it stands now, the effect is broad enough that police, fire, amateur, and any other service that uses sensitive receivers will not be able to use the RF emitting LED.

John PUccetti

I have been buying RoHS par 38 LED floods do they emit RF? Wholesaler LEDWHOLESAlER.COM says no.


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