[RFI] LED bulb replacements for use in existing florescent fixtures

Dale Johnson dj2001x at comcast.net
Wed Dec 5 16:20:44 EST 2018

I got the replacement LED shop lights that do not reuse the old ballasts for my basement shop and finished area in the basement.  The old ballasts are removed and the 115vac is wired directly to the new LED shop replacement lights, they plug right into the sockets which are hardwired into the electric wiring.  

The other LED replacements in my garage shop were complete new fixtures and they are quiet, UNLESS you chain them then they are noisy.  By chaining them I mean plug one fixture into another.  I plugged each fixture into an outlet in the ceiling and they are  quiet.  

Dale, K9VUJ

On 05, Dec 2018, at 14:10, John K9UWA <john at johnjeanantiqueradio.com> wrote:

Your Wasting your time and money to install " Direct Replacement " 4 foot bulbs. 
That still leaves the ballasts in place. Then you will be replacing the ballasts next 
plus every one of them I ever tested created RFI. Yes the ballasts make noise. 

I see many comments that these bulbs are quiet with no qualification as to how 
you determined that the bulbs were quiet. Maybe that means you don't notice the 
noise in your receiver and your antenna is 100 feet up or away from your bulbs 
and fixtures. Maybe you have some much other noise entering your radio you 
don't notice the noise from the ballasts and old style flourescent bulbs. 

Try this take some battery operated transistor radio best if you have one that 
covers short wave as well as broadcast band. Tune it up to NO STATION and 
then get close to your fixtures. 

After installing something close to 200 DIRECT WIRE BALLAST BYPASS bulbs I 
am quite happy with them. The key is the wording of either Direct Wire or Ballast 
Bypass seem to be the two different terms used. These bulbs carry a 50,000 hour 
warranty. They don't make noise. Usually if you get within about 1 foot of the bulb 
then you can hear it. It doesn't take 10 minutes to remove the old bulbs remove 
the ballast and rewire the fixture to accept the Direct Wire Bulbs. 

If sure beats replacing bulbs on a once a month basis there are always a couple 
of them burned out. And for sure as a Ham with a station it is nice to know your 
ability to hear other hams has been enhanced a bit.

John k9uwa

> On 11/15/2018 12:18 PM, Jeff Blaine wrote:
>> Any experience with LED direct-replacements that are supposed to work 
>> with existing ballast/fixtures?
>> I have a number of F28/T5-4' long fixtures that seem to eat the bulbs 
>> about as fast as I can get around to replacing them.  Would like to 
>> put an end to those with some LED replacements if the RFI picture is 
>> manageable.
>> 73/jeff/ac0c
>> alpha-charlie-zero-charlie
>> www.ac0c.com

John Goller, K9UWA & Jean Goller, N9PXF 
Antique Radio Restorations
k9uwa at arrl.net
Visit our Web Site at:
4836 Ranch Road
Leo, IN 46765

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