[RE-wrenches] 110Vac LED resistance to weak grids in developingworld

[Joel Davidson]

LED teardown at http://www.edn.com/blog/PowerSource/41611-Samsung_LED_light_bulb_teardown_includes_objective_dimming_numbers.php?cid=EDNToday_20120210

  ----- Original Message ----- 
  From: Jesse Dahl 
  To: RE-wrenches 
  Sent: Friday, February 10, 2012 5:32 AM
  Subject: Re: [RE-wrenches] 110Vac LED resistance to weak grids in developingworld


  I don't know about spikes or grid events, but my home is 3/4 LED and have zero complaints.  The warranty on them is a little weak compared to life cycle......  All of mine vary in K rating and lumens and work beautifully. 





  Sent from my iPhone

  On Feb 9, 2012, at 7:45 PM, Ray Walters <ray at solarray.com> wrote:


    Personally I love my latest LED lights.  They have gotten substantially better just in the past year.  We have some 8 watt units in our kitchen that illuminate just like a 35 watt halogen, beautiful color rendition, not that blue they used to have.  
    I especially like my new 1000 lumen spotlight that lights up brighter than a car head light in a package slightly larger than the old mini mag flash lights.
    However, I have no experience with ham radio, or theRF interference issue.  We're WiFi, and cell at our house.  I do some audio recording, etc. and haven't noticed any extra buzz from the several LEDs I have in my basement studio.

    Ray

    On 2/9/2012 4:54 PM, toddcory at finestplanet.com wrote: 
      i have some personal experience with led light bulbs. i put them outside because the cfl floodlights are very s-l-o-w to warm up to full brightness.



      1) leds are still slightly less efficient (lumens per watt) than cfl's

      2) led light bulbs (2 different brands) throw out an ungodly amount of rfi... want to listen to a conversation on the 2 meter ham radio or listen to a weak fm broadcast station or watch channel 6 on the tee-vee? go shut off the led lights off first.



      my conclusion? led light bulbs are not ready for prime time.



      todd (still using my 25+ year old phillips dulux cfls)







      On Thursday, February 9, 2012 1:44pm, "Jim MacDonald" <jmac at solaresystems.com> said:



      Hello wrenches



      I am in Central America and looking to suggest customers buy efficient LEDs for illumination in their 120V-wired homes, connected to local power grids with less-than-desirable power quality.



      I see that so many manus claim long life for the LEDs, in the tens of thousands of hours, yet so few if any back it up with a decent warranty.


      Folks are hesitant to make this investment, believing that voltage surges or dips could destroy the LEDs.



      Has anyone heard of LED lights' lives ending prematurely due to grid events? 

      Would inline surge protectors [something small to be installed immediately downstream of the breaker in the home's main panel) be helpful, and if so, does anyone have any recommended brands?


      thanks

      Jim MacDonald




      Sent from Finest Planet WebMail.

       

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