10 responses to “EEVblog #362 – LED Tube Lighting Install & Theory”

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  William October 2nd, 2012 at 19:44

  Anyone else notice some strange noises in the audio starting at about 28:55 once the LED tubes are turned on?

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  • 

    Goophy629 October 2nd, 2012 at 20:22

    Yea, some long and raising beeps…disappeard after the big bang…

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    Worf October 3rd, 2012 at 04:45

    Heard those – thought it’s some RF interference with the LED tubes. Once the tubes burn in it tends to disappear quite quickly.

    Seen it with some LED bulbs where they’d interfere with FM radio for a bit, but once they’ve been installed awhile it goes away.

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  Rob October 3rd, 2012 at 02:29

  Magic Smoke, I remember my boss setting a cap off in a VCR once and it was a spectacular acid plume, must have reached about 4 foot into the air.

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  Worf October 3rd, 2012 at 04:46

  Instead of using white LEDs – how are using arrays of red/green/blue LEDs? Compensating for the differences in brightness and whatnot – do they give better color and all that?

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  Salas October 3rd, 2012 at 07:04

  Dave, was it a fully satisfying upgrade after all? Maybe it takes even more light for impressing the eye VS what was installed before. Surely a good economy move, regarding consumption and longevity at least.

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    EEVblog October 3rd, 2012 at 21:16

    Another video uploading now that hopefully shows the difference. Yes, it’s a massive difference. I’m now using more power because of the 2x20W 3m strips + 2x60W diffused panels.
    Hard to catch the differences on camera though.

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  Wartex October 3rd, 2012 at 09:25

  This is the 2nd time you botched the starter explanation. This is how starters look like http://i.imgur.com/hfPlK.jpg

  The GDL (gas discharge lamp) is normally OPEN. Also the bimetal is INSIDE the GDL and is integral part of it, there is nothing connected in series. At first the gas inside the GDL is ionized which heats up the bimetal and causes it to close. This is called “preheating stage”. As soon as bimetal closes, the filaments glow and heat up the gas inside the fluoro tube. The bimetal opens as the gas cools down inside GDL and the ballast dumps the energy into the main tube, this is called a “strike”. Now you have the current flowing from filament to filament and there is not enough current flowing via GDL to heat up the gas enough to short the bimetal again.

  Jeez, get it right already.

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  • 

    f4eru October 8th, 2012 at 07:22

    Yep, right.

    You could represent it as paralell tube and switch, electrically at least.

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• 

  Warren April 28th, 2013 at 19:24

  Dave,
  You need to scoot those LED tubes all the way to the wall to get the best lighting for that dark corner.
  Then install one under the first shelf of your bench!
  -Warren

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