[TVARC] LED bulb tests

[Rich Erlichman]

Among other reasons, the LED replacement bulbs have a hi-impedance electronic circuit that converts the 120VAC at the base to a low DC voltage that most LEDs are usually happier with.

You can usually see on the box the bulb came in, with two wattage rating. The equivalent wattage (compared to normal incandescent/filament light bulb), and the actual wattage the LED consumes (usually much less). The lower (actual) wattage would explain the less power used in your household, lower current drain, etc.

For example, I have 100w LED replacement bulbs that only use 15w in terms of actual power consumption.

I have almost all LEDs throughout my house. Much cheaper to run, and last longer than standard bulbs.

 

--Rich, ND4G

 

From: tvarc-bounces at mailman.qth.net [mailto:tvarc-bounces at mailman.qth.net] On Behalf Of doncrosby--- via TVARC
Sent: Monday, August 06, 2018 8:08 AM
To: bobandsandy1964 at gmail.com; tvarc at mailman.qth.net
Subject: Re: [TVARC] LED bulb tests

 

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

 

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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