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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.
The finding is that measured power is less than expected so the bulbs do become more efficient.
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.
> --- "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?
>> Who probalby should have just bought the cheap PC dealy.
>> Joshua L. Wiegert
>> Native Fish Conservancy Lists Administrator
>> JLW at dune_net
>> AIM UID: JoshuaWiegert
>> Feel free to contact me by any of the above means for any
>> Aquatic-Plants mailing list
>> Aquatic-Plants at actwin_com
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