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Re: [APD] LEDs once more



Good points.............he didn't also mention the heat output compared to
metal halide.   I avoid metal halide for this reason.    Some aquarists
would pay for a superior light ..........I will pass this along.  Not sure
if we account for the majority of aquarists.

Terry
----- Original Message ----- 
From: "Stuart Halliday" <stuart at mytriops_com>
To: "aquatic plants digest" <aquatic-plants at actwin_com>
Sent: Friday, December 07, 2007 4:31 PM
Subject: Re: [APD] LEDs once more


> I believe TBarber wrote this email section below:
>
> > "Cree XR-E Spectral Dist" is the wavelength distribution for one of the
> > white LEDs we use (full datasheet at
> > http://www.cree.com/products/pdf/XLamp7090XR-E.pdf)
> >
> > compared to
> >
> > "Ushio Aqualite Spectral Dist" for a specialty lamp from a company I've
> > actually talked with about aquarium/marine applications. (full datasheet
at
> > http://www.ushio.com/files/specs/Aqualite.pdf)
>
> > The primary problem with LEDs for aquarium lighting (and we've looked at
it
> > with some potential partners) is the cost. The 150W Aqualite lamp
produces
> > 7000 lumens (lumen is a measurement of raw light output from a source)
for
> > about $65, but you'd need 70 or so white LEDs (and even more blue LEDs)
to
> > get the same light output at a cost of $150 or more.
>
> Is that cost over the same amount of hours?
> LEDs last for 50,000 hours. The Aqualite lamp is rated at 6000 hours.
>
>
> Aqualite lamp            = 6000 hours @ $65
> Cree XLamp LEDs          = 50,000 hours @ $150 or $18 for 6000 hours
>
> Note: LEDs only dim by 30% after its rated lifetime, a lamp dims 100% by
> that time! :-)
>
> Hmmm. looks like LEDs may be are cheaper.
>
> But I see Cree have an LED in R&D with a 1000 lum so we'll not need 70.
>
> Plus I see each LED produces 1.1W so 70 will produce 80W, almost half the
> power of the lamp, so this may half cooling costs.
>
>
> -- 
> Stuart Halliday
> http://mytriops.com/
> 200 Million years in the making...
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>
>
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