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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.
----- 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
> > http://www.ushio.com/files/specs/Aqualite.pdf)
> > The primary problem with LEDs for aquarium lighting (and we've looked at
> > with some potential partners) is the cost. The 150W Aqualite lamp
> > 7000 lumens (lumen is a measurement of raw light output from a source)
> > about $65, but you'd need 70 or so white LEDs (and even more blue LEDs)
> > 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
> 200 Million years in the making...
> Aquatic-Plants mailing list
> Aquatic-Plants at actwin_com
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