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Energy saving light bulbs

Discussion in 'Off-Topic Discussion' started by pete, Dec 29, 2017.

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  1. clanless

    clanless Total Gardener

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    One of my friends is an electronics guru - he told me that high power led bulbs (by high we mean 15w here to produce the equivalent light of a 100w incandescent) will produce a lot of heat - I asked him because my 15w led bulb was too hot to handle.

    I think in the lumens per buck competition - CFL's are more cost effective than led's.:dbgrtmb:
     
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      clanless, Dec 29, 2017
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    • Fat Controller

      Fat Controller 'Cuddly' Scottish Admin! Staff Member

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      I agree and disagree @clanless - high power LED's will produce heat, hence they need to have suitable heatsinks to ensure that they do not overheat, however, I would still far rather have an LED array than CFL's any day of the week, not least as the light out put is more usable.
       
      Fat Controller, Dec 29, 2017
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    • clanless

      clanless Total Gardener

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      I've changed my mind led are the best per buck - I was still thinking they were 20 sheckles a piece.

      Have a look at this pic - all 100w lumen output:

      doortest.jpg

      Is it just me or does the incandescent give a better spread of light?
       
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        clanless, Dec 29, 2017
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      • Fat Controller

        Fat Controller 'Cuddly' Scottish Admin! Staff Member

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        Not just you - it is a fact. It is a symptom of how LED lamps work. Bear with me and I will draw a wee diagram.

        In the words of the great Arnold Fartzenshagger - - I'll be back!
         
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          Fat Controller, Dec 29, 2017
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        • Fat Controller

          Fat Controller 'Cuddly' Scottish Admin! Staff Member

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          OK, not the best drawings, but it will hopefully explain:


          Incandescent bulb:
          LEDC2.png

          LED chip (SMD):
          LEDC3.png


          The workaround:

          LEDC4.png
           
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            Fat Controller, Dec 29, 2017
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          • shiney

            shiney President, Grumpy Old Men's Club Staff Member

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            Still prefer incandescent :snorky: but I'm a devout Luddite. :blue thumb:
             
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              shiney, Dec 29, 2017
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            • martin-f

              martin-f Plant Hardiness Zone 8b

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              Ive just put LED lights in the living room, I don't see the need to go above 5W tbh unless there outside as a security light or you only have one holder in the room, my light holders are 5w max rated anyhow its not wise to put larger bulbs in you risk a fire check the holder rating before you buy bulbs.
               
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                Last edited: Dec 29, 2017
                martin-f, Dec 29, 2017
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              • martin-f

                martin-f Plant Hardiness Zone 8b

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                Our living room is small 4mtr by 4mtr and I have four 5W LED, no flash used when pictures taken.

                IMG_0840.JPG
                 
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                  martin-f, Dec 29, 2017
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                • pete

                  pete Growing a bit of this and a bit of that....

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                  I think I'd be one of those, ...if I knew what they were.:biggrin:
                   
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                    pete, Dec 29, 2017
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                  • ARMANDII

                    ARMANDII Low Flying Administrator Staff Member

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                    I have two LED strip lighting bars in my kitchen in replacement of the fluorescent tube lighting and they're brighter and consume much less power than the fluorescent strips.:snorky:
                     
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                      ARMANDII, Dec 29, 2017
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                    • shiney

                      shiney President, Grumpy Old Men's Club Staff Member

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                      Just to put the cat among the pigeons!

                      There is a theory with, at the moment, only a little evidence (mainly empirical) that LED lights close to eyes (reading lamps etc.) could have a deleterious effect on the vitreous lining in the eyes. :dunno:
                       
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                        shiney, Dec 29, 2017
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                      • ARMANDII

                        ARMANDII Low Flying Administrator Staff Member

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                        Well, mine are fitted to the Kitchen Ceiling, Shiney, which should give enough distance:dunno::snorky:. Don't forget there is also a Government backed scheme to swap over Street and road lighting from Sodium lamps to LED.
                         
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                          ARMANDII, Dec 29, 2017
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                        • pete

                          pete Growing a bit of this and a bit of that....

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                          Well our workshop, where I work, is pretty much all LED lighting now.
                          And I must admit, although it is brighter, sometimes it's difficult to read a steel rule until you get the reflection sorted out, from some angles you just cant see the numbers.
                           
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                            pete, Dec 29, 2017
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                          • ARMANDII

                            ARMANDII Low Flying Administrator Staff Member

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                            [​IMG]
                             
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                              ARMANDII, Dec 29, 2017
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                            • Fat Controller

                              Fat Controller 'Cuddly' Scottish Admin! Staff Member

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                              Yeah, there is also a theory at the moment trying to suggest that the earth is flat...... ;)
                               
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