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Re: [RFI] Cree LED Bulbs?

To: rfi@contesting.com
Subject: Re: [RFI] Cree LED Bulbs?
From: Aaron Kreider <aaron@campusactivism.org>
Date: Sun, 31 Mar 2013 16:43:57 -0400
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
I skimmed most of the thread on the Cree LED bulbs. I didn't catch the conclusion -- were they bad RFI producers or not?

...


I bought a bunch of LED bulbs on Ebay which are terrible RFI producers. I could hear them 10 feet away on my QS1R with a 2 foot wire antenna. And I could hear it over my computer noise!
http://www.ebay.com/itm/7W-LED-E27-Lamp-Bulb-Warm-White-Light-Energy-Saving-Bright-input-AC-85V-260V-HS4-/310642281478?pt=US_Light_Bulbs&hash=item4853b90c06

Another interesting item is that they say 7 watts (85 VAC - 240 VAC), but are actually 2-3 watts when running them on 120 VAC and probably producing a third of the lumens. So they are dim. They cost around $5. Quality control or shipping is terrible as many of the bulbs tend to rattle due to loose components.


By contrast the Utilitech LED bulb 7W ($10) that I bought at Lowes for $10 shows next to zero RFI within inches of my 2 foot wire antenna. It uses 7 watts on 120 VAC and produces a lot more light than the Ebay bulbs. I recommend this bulb.
http://www.lowes.com/pd_338802-75774-LA19DM/LED_0__?productId=3341246&Ntt=led+bulb&pl=1&currentURL=%3FNtt%3Dled%2Bbulb&facetInfo=


I also tested several CFLs (mostly 13 watts) from Lowes and they didn't produce significant RFI (recall this is using a small antenna next to a computer).


Aaron
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