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Actual design question.

Discussion in 'Electronic Design' started by Homer J Simpson, Mar 11, 2007.

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  1. Can CFLs be reconfigured to run off a DC supply? Minimum voltage?
     
  2. Phil Allison

    Phil Allison Guest

    "Homer J Simpson"

    ** Your heading is BOLLOCKS !

    ** With most CFLs there is no need to do anything.



    ** Depends on the CFL of course - dickhead.

    Ones I have here ( rated for 220 - 240 volt AC operation) light up at
    anywhere from 70 to 200 volts DC and reach full brightness at about 300.

    The light up voltage depends greatly on the temperature with many CFLs while
    brightness is roughly proportional to the voltage - ie half rated voltage
    = half max light output in lux.

    YOU will just have to try some out.



    ......... Phil
     
  3. I suppose it depends on the CFL ballast design. I cut one open once. The
    120 Vac line input drives a rectifier and a filtering cap. I'd guess
    that one could feed 170 Vdc in at this point.
     
  4. So the other way is to dump the electronics and add a fluo inverter / driver
    I guess.
     
  5. Phil Allison

    Phil Allison Guest

  6. Bob

    Bob Guest

  7. Phil Allison

    Phil Allison Guest

    "Bob The Tenth Wit **** "



    ** Please remember to take your head out of that donkey's backside before
    you post anything.





    ........ Phil
     
  8. 12v CFL Light Bulbs Price Ex VAT = £ 10.50

    As compared to 99 cents for 120 VAC.
    He's a sad case, no? And he can't read : "Can CFLs be reconfigured to run
    off a DC supply? Minimum voltage?"
     
  9. Phil Allison

    Phil Allison Guest

    "Homer J Simpson Fucking IDIOT "


    ** Shame it says not ** one tiny thing ** about 12 volts.

    YOU ASD FUCKED BRAIN DEAD **** !!!




    ........ Phil
     
  10. Eeyore

    Eeyore Guest

    Anything you like within reason. 12V DC versions exist.

    Graham
     
  11. Robert Baer

    Robert Baer Guest

    *Any* fluorexcent lamp can run off of DC; the problem is to first
    strike that arc, which takes high voltage.
    When the arc is present, then it is wise to use current limiting so
    as to not overheat the poor lamp; typical voltage drop is the first
    ionizationpotential of mercury ~32V.
     
  12. Robert Baer

    Robert Baer Guest

    That is with an inverter AKA "ballast".
    What i answered was relative to the bulb itself absent electronics.
     
  13. Eeyore

    Eeyore Guest

    By CFL I expected he meant the latter.

    Graham
     
  14. ISTR some fairly compact designs to run the tube off a low voltage supply.
     
  15. Robbo

    Robbo Guest


    I recall reading something about premature blackening at one end of the
    "tube" and early failure if dc is used with fluoro's????
     
  16. Phil Allison

    Phil Allison Guest

    "Robbo"

    ** All modern CFLs use electronic ballasts - ie high frequency inverters -
    to drive the tube.

    The AC supply is rectified and used as a source of DC voltage for that
    inverter !!!!!

    Eg: http://www.repairfaq.org/sam/cflamp1.pdf




    ....... Phil
     
  17. John  Larkin

    John Larkin Guest

    I just picked up eight 18-watt spiral-tube cfl's at Cole Hardware, 50
    cents each, subsidized by PG&E. They're guaranteed for 12 years. I
    don't believe that. My experience with cfl's is that they blow up
    fairly often, especially if started/stopped a lot.

    John
     
  18. And they don't much like outside light fittings.
     
  19. Eeyore

    Eeyore Guest

    I've never had one 'blow up' in some 15 years of using them.

    Almost all have been Philips or Osram though.

    Graham
     
  20. Eeyore

    Eeyore Guest

    Why's that ?

    Graham
     
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