[TVARC] LED bulb tests

[Robert Averitt]

Fellow hams:

I discovered something today that I wanted to share with you ...

I had installed an LED-adapter bulb in my pole lamp in the yard and noticed
last night it was not working.

I removed it, brought it inside the house and tried it in another light –
it worked.

I installed an incandescent light in the pole light and – nothing.  I
discovered that the 5-year-old ‘light sensor’ on that pole lamp was bad.  I
tested a spare and it works so will replace the pole lamp light sensor
tomorrow but ....

At the same time, I decided to replace the incandescent 40-watt flood lamp
on my work/radio bench with a 60-watt LED.  When I measured across the
power plug of that 40-watt bulb, I saw about 60 ohms but, with the LED in
(I tried several), it measured over 2 megohms.  However, I plugged all of
them in and they all lit!



My point:  you can measure an incandescent bulb with a multimeter and get
reading of not over 100 ohms but the LED-adapter appears OPEN even though
the bulb is good!  The ONLY reliable test to make sure an LED bulb is good
is to plug it in BEFORE using it.



73,

Bob

WA3EWK
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