Geting information about a bulb

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  • playman
    Badcaps Veteran
    • Jan 2011
    • 252
    #1

    Geting information about a bulb

    I have some bulbs here from a christmass decoration, now this season has started again(feels just like it was yesterday)

    So my question is.
    How can I find out it's Wattage Amperage and Volt, if it has no reading on it?
    isint there some way to mesure it?
    Tags: None
    • b700029
      Banned
      • Sep 2010
      • 640
      #2
      Re: Geting information about a bulb

      You can measure the resistance and make an estimate of the power which should let you apply the right voltage without burning it out.

        Comment

        • playman
          Badcaps Veteran
          • Jan 2011
          • 252
          #3
          Re: Geting information about a bulb

          thanks for that b700029

            Comment

            • Agent24
              I see dead caps
              • Oct 2007
              • 4923
              • New Zealand
              #4
              Re: Geting information about a bulb

              If it's an incandescent bulb, measuring the resistance with a meter is useless.

              The filament actually changes resistance when it heats up and glows, and is a lot higher when running than when cold.

              I don't know if there is a formula you can use to calculate the normal resistance from the cold resistance (There very likely is)

              But as it stands now, your resistance measurement will not give you accurate information about the bulb.
              Last edited by Agent24; 11-30-2011, 10:03 PM.
              "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
              -David VanHorn

                Comment

                • PCBONEZ
                  Grumpy Old Fart
                  • Aug 2005
                  • 10661
                  • USA
                  #5
                  Re: Geting information about a bulb

                  Originally posted by playman
                  isint there some way to mesure it?
                  Only by destructive testing.
                  Mann-Made Global Warming.
                  - We should be more concerned about the Intellectual Climate.
                  -
                  Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
                  - Dr Seuss
                  -
                  You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
                  -

                    Comment

                    • PCBONEZ
                      Grumpy Old Fart
                      • Aug 2005
                      • 10661
                      • USA
                      #6
                      Re: Geting information about a bulb

                      Originally posted by Agent24
                      I don't know if there is a formula you can use to calculate the normal resistance from the cold resistance (There very likely is)
                      There is but you'd have to know things like the material, the material's electrical properties, the diameter and the length.
                      .
                      Mann-Made Global Warming.
                      - We should be more concerned about the Intellectual Climate.
                      -
                      Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
                      - Dr Seuss
                      -
                      You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
                      -

                        Comment

                        • playman
                          Badcaps Veteran
                          • Jan 2011
                          • 252
                          #7
                          Re: Geting information about a bulb

                          Well I guess this is a lost case, damn it.

                          well thanks every one for your input.

                            Comment

                            • PCBONEZ
                              Grumpy Old Fart
                              • Aug 2005
                              • 10661
                              • USA
                              #8
                              Re: Geting information about a bulb

                              What are you trying to do anyway?
                              .
                              Mann-Made Global Warming.
                              - We should be more concerned about the Intellectual Climate.
                              -
                              Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
                              - Dr Seuss
                              -
                              You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
                              -

                                Comment

                                • dumpystig
                                  Badcaps Veteran
                                  • Jul 2011
                                  • 485
                                  • UK
                                  #9
                                  Re: Geting information about a bulb

                                  Try it connected to a couple of AA's, then 4 etc. - gradually increase the voltage until it illuminates but at a level that is not too bright otherwise you will burn it out.
                                  System: HP xw6600 Workstation, 650W PSU | 2x Intel Xeon Quad E5440 @2.83GHz | 8x 1GB FB-DDR2 @ 667MHz | Kingston/Intel X25-M 160GB SSD | 2x 1TB Spinpoint F3, RAID0 | 1x 1TB Spinpoint F3, backup | ATI FireGL V7700 512MB | Sony Optiarc DVD +/-RW | Win 7 Ultimate x64 | 2x Dell UltraSharp U2410f | Dell E248WFP

                                    Comment

                                    • Agent24
                                      I see dead caps
                                      • Oct 2007
                                      • 4923
                                      • New Zealand
                                      #10
                                      Re: Geting information about a bulb

                                      What does the bulb look like? (photo?)
                                      What power source does the decoration run from?
                                      How many bulbs are in it and how are they connected (series, parallel etc)?

                                      You might be able to find out more about the bulb by taking these things into account


                                      Can you find the decoration for sale anywhere? Can you ask them if they sell spare bulbs? If so, perhaps they know the specifications.
                                      "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                                      -David VanHorn

                                        Comment

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