EMC and LED light

When LED lights came available, they were expensive. They were outperformed by a simple flashlight running on 2 D cells. The light spectrum was horrible, too. Good enough for the bathroom maybe, but not for a living room. Technology changed, fortunately. New LED light bulbs (bulbs?) are better than ever, cheaper than ever and the light spectrum is almost as good as the old, faithful light bulb (which I stockpiled).

LED Light Bulb, 44 pieces of 5050 LED's. The amount of light emitted by these bulbs is about equal to a conventional 40-50 Watt light bulb.

But what about EMC? No better way to find out than to buy a few on eBay. I paid less than $10 for two of these. That was a lucky find; normally they go for about $8/piece or so. I screwed both in, switched on my portable SW radio and held it close to the lamps, while checking all possible frequencies. Nothing. Nada. Zilch. No interference at all. This surprised me, to say the least. Other radio operators did report interference, and they bought respectable brands instead of cheap stuff made in China. I might buy a few more of these later in time. Or not, the expected life span exceeds 50.000 hours…

Product Details:
E27 LED Lamp
Base Type: E27
44 pieces SMD 5050 LEDs
Voltage: 85-265V
Power: 9W
Lumen: 700
Color temperature: 3000-3500K
Light color: Warm White
Lighting angle: 270 degrees
Lamp Size: approx. (LxD) 10.8 x 3.5cm / 4.25″ x 1.38″
Service life: 50.000 hours or more


3 comments on “EMC and LED light

  1. Interessant, ik gebruik 2 LED lampen. 1 in de gang en 1 op de overloop. Beide hebben een consumptie van 2W en geven ongeveer 20W aan licht. Nou heeft de vorige bewoner hier ooit de fase/nul verwisseld en staat de fase op de nul van de lamp. Gevolg is dat deze zelfs als de lamp uit is altijd heel zwak blijft “gloeien”. Hebben die nieuwe lampen die jij gebruikt dat ook nog?

  2. At LA2Z we have tested many LED lamps using a 1500MHz HP spectrum analyzer and a 50-1300MHz discone antenna at 3-4m. This is similar to CISPR 15 EMC testing. In addition we used a stand alone FM receiver.
    Results were disturbing. Many LED lamps were OK, but many emitted a lot of radiation, up to -40dBm as far as 350MHz. In several cases the FM receiver was completeley blocked, not possible to receive any broadcast stations. On radio amateur HF and VHF frequencies noise was well above S9 in worst cases.
    Near field measurements show that the problem is the switch mode supply that is required to feed the LED unit. Switch frequency is typically 40-120kHz that has many harmonics. These harmonics really needs a filter !
    The EN 55015:2013 has included LED light and requirements for radiated disturbances between 30 and 300 MHz.
    We hope for a noise free environment in the future.

    Helge LA6MV

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