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Re: [APD] ODNOS



Sounds like you might not be using the right ballast.  This article from TPT shows how to do ODNO and discusses measured output.  
http://www.plantedtank.net/forums/showthread.php?t=21257

The finding is that measured power is less than expected so the bulbs do become more efficient.

-Paul

On Thu, 15 Dec 2005, S. Hieber wrote:

> One factor might be that the efficiency declines as you
> overdrive so doubling the power won't yield a doubling in
> light output.
>
> Some ballasts can limit current even if you try to
> overdrive them and that could be coming into play also.
>
> sh
>
>
>
> --- "Joshua L. Wiegert" <JLW at dune_net> wrote:
>
>> Okay, I've got four overdriven 40W lamps on a 55-gallon,
>> and finally got
>> around to setting it all up.  I hate to say this, but it
>> looks like a lot of
>> trouble for not much. :)  The lamps get warmer,
>> definitely: but I don't see
>> a lot of difference between 4x40 OD and 4x40 standard.  I
>> shut it down to
>> one bulb, and compared to a standard one I have -- cast
>> it at the ceiling
>> from the floor, and both looked about the same.  I even
>> tried the
>> ink-through paper test (take several sheets of thick,
>> white paper, and write
>> something on the bottom one.  Hold it over a lamp, and
>> lift it until you can
>> no longer see what is written on the bottom sheet.
>> Measure the distance.)
>> The difference between teh ODNO and the standard was
>> marginal, and may very
>> well have been more due to the fact that the standard
>> bulb was older and had
>> some water marking on it.
>>
>> Have I stumbled onto some sort of smart ballasts that
>> know how many bulbs
>> are on them, and aren't cooperating? :)  These bulbs
>> should be twice as
>> bright as a standard flourescent, right?   So far, all
>> I've managed to do is
>> find a way to use a flourescent as a heater -- they get
>> much warmer.  Did I
>> wire something wrong, or am I just not able to perceive
>> the difference in
>> light output?
>>
>> JW
>> Who probalby should have just bought the cheap PC dealy.
>> :)
>> --
>> end
>>   ____^___
>>> <,DARWIN,>
>> Joshua L. Wiegert
>> Native Fish Conservancy Lists Administrator
>>      JLW at dune_net
>> AIM UID: JoshuaWiegert
>>             Yahoo:
>> JLW_DUNE_NET
>>
>> HTTP://WWW.NATIVEFISH.ORG/JWiegert/index.html
>> Feel free to contact me by any of the above means for any
>> reason.
>>
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>>
>>
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