[TVARC] LED bulb tests

[doncrosby at aol.com]

Bob


Probably has a capacitor right in series with the circuit input, so it would show an open on DC meter.


Don



-----Original Message-----
From: Robert Averitt <bobandsandy1964 at gmail.com>
To: TVARC <tvarc at mailman.qth.net>
Sent: Sun, Aug 5, 2018 11:08 pm
Subject: [TVARC] LED bulb tests




 
Fellowhams:
Idiscovered something today that I wanted to share with you ... 
Ihad installed an LED-adapter bulb in my pole lamp in the yard and noticed lastnight it was not working. 
Iremoved it, brought it inside the house and tried it in another light – it worked.
Iinstalled an incandescent light in the pole light and – nothing.  I discovered that the 5-year-old ‘lightsensor’ on that pole lamp was bad.  Itested a spare and it works so will replace the pole lamp light sensor tomorrowbut ....
Atthe same time, I decided to replace the incandescent 40-watt flood lamp on mywork/radio bench with a 60-watt LED. When I measured across the power plug of that 40-watt bulb, I saw about 60ohms but, with the LED in (I tried several), it measured over 2 megohms.  However, I plugged all of them in and theyall lit!
 
Mypoint:  you can measure an incandescentbulb with a multimeter and get reading of not over 100 ohms but the LED-adapterappears OPEN even though the bulb is good! The ONLY reliable test to make sure an LED bulb is good is to plug it inBEFORE using it.
 
73,
Bob
WA3EWK
 



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