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View Diary: Something to watch with LED lighting (233 comments)

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  •  Depends on the shape of the bulb (31+ / 0-)

    I have a couple of "flood" ceiling LEDs.  I suspect they'll last a long time.  They are designed for that purpose, and the actual LEDs in the bulb are spread out across the plane of a disk.  So the heat they dissipate (only about 7 watts) isn't concentrated.

    Some of  the ones that try to put out a lot of light from a small space, in the shape of an incandescent bulb, could have a problem.  They stick the LEDs close together on a sort of stick in the middle of the bulb.  There is less space between them and less room for heat to dissipate.

    They are all pretty new, and the  makers are still coming up with new designs; some of the early ones may turn out to have the wrong design.  Imitating an incandescent might not be the ideal form factor.

    •  I have had terrible performance w/such bulbs (6+ / 0-)

      My Father-in-Law gave us a case of "Miracle LED" bulbs.  I installed these in a bathroom row fixture, and in a table lamp, and other ceiling lamps, and their life-span has been mere hours.   Some of these 60W Bulbs lasted only about 3 or 4 hours.  Had no idea about the heat; assumed that heat was insignificant in such cool bulbs.   Oh well.  

    •  Excellent comment (4+ / 0-)
      Recommended by:
      Betty Pinson, DerAmi, kyril, northsylvania

      No matter how cynical you become, it's never enough to keep up - Lily Tomlin

      by badger on Tue Jan 14, 2014 at 07:33:15 PM PST

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    •  Eureka, you got it (23+ / 0-)

      I used to work for an LED manufacturer, and our field reps would come back with failed LED lights that customers had bought a while ago from elsewhere.   Pretty much in every situation, the LED base---that which the LED is attached--was a poor heat sink and the heat sink and whatever it was attached to were scorched.  

      People can realize that a computer CPU has the same issues--it gets hot and there's a lot of engineering done to establish a very effective heat sink and to provide good cooling effects--fans, etc.   Turn off your CPU fan and your case fan and you got an environment analogous to a LED lighting fixture.

    •  The Dilemma (1+ / 0-)
      Recommended by:

      That reminds me of that awful scene in that awful movie The Dilemma where Kevin James is selling the concept of an electric (or hybrid) car that sounds like a macho machine because it essentially has speakers that mimic a 442, in concert with the gas pedal. ROAR!

      That, to me, is an incredibly banal statement on the human race; that we are thought to be comfortable to the point of obscurity.

      Well, that's marketing for you!

      •  There actually was a serious discussion of this (4+ / 0-)
        Recommended by:
        cosette, Bluesee, badger, jorogo

        years ago, as a valid safety issue.  When an electric car is moving at very low speed (as among pedestrians) there ought to be something to alert them to the presence of a vehicle moving near them.  Nobody was taking about VROOM-VROOM!, but something easily heard w/o being obnoxious.

        It has always annoyed and distressed me that pedestrians in store parking lots, for example, walk right in the middle of the car lane with ZERO situational awareness.  Must be a death wish.  I often am tempted to slap a 'I HAVE A DEATH WISH! bumper sticker on their rumps.  But I suppose I'd be arrested for sexual assault if I did, or get myself shot at.

        Real plastic here; none of that new synthetic stuff made from chicken feathers. By the morning of 9/12/2001 the people of NYC had won the War on Terror.

        by triplepoint on Wed Jan 15, 2014 at 12:42:03 PM PST

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        •  There still is a discussion. (2+ / 0-)
          Recommended by:
          triplepoint, RiveroftheWest

          A notable point is that the problem with not hearing approaching vehicles is dependent on background noise as much as vehicle noise.

          A comment I read at a Yahoo Answers makes this point well:

          The audible signal that drivers can use to alert those around them of their presence is called a horn....Audible signals for low speed electrics seem to make some sense when there is only one car in the area but imagine a parking lot with 15 cars looking for spaces all making some sort of piercing signal as they travel at a low speed. Suddenly what was intended as a safety feature becomes a potential hazard.
          Then there's the "loud pipes save lives" approach to enabling a noisier world for us all.

          "All war is stupid" - JFK

          by jorogo on Wed Jan 15, 2014 at 05:00:05 PM PST

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    •  Yes. (4+ / 0-)
      Recommended by:
      kyril, Betty Pinson, Bluesee, badger

      In this case, we need to understand that new light fixtures may have a different design.

      One would like to think that we can just put an LED light in an existing design. But remember, that design originated a long time ago based upon the type of bulb available.

      While we certainly can expect an LED light bulb that can perform well in our existing fixtures, those LEDs would have design requirements that increase the cost as opposed to new fixtures that are designed with the LED source in mind.

      This better be good. Because it is not going away.

      by DerAmi on Wed Jan 15, 2014 at 02:01:53 AM PST

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