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[APD] Re: Leaky Eheim (Dirk.Matthys@toyota-europe.com)
I have to totally disagree on the use of Vasaline or any other petroleum jelly product on a filter's O-ring.
Petroleum jelly (Vaseline) will actually degrade the rubber, causing it to break down and get "gooey" for the lack of a better term. That O- ring will eventually fail and the canister filter will surely leak.
Any non-petroleum based lubricant (K-Y Jelly fdor instance) would be a much better choice.
Mike Firrincili
----- Original Message -----
From: aquatic-plants-request at actwin_com
Date: Wednesday, February 9, 2005 12:01 pm
Subject: Aquatic-Plants Digest, Vol 18, Issue 16
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> Today's Topics:
>
> 1. Re: AHSUPPLY's Reflectors (Vaughn Hopkins)
> 2. Re: Leaky Eheim (Dirk_Matthys at toyota-europe.com)
> 3. Re: AHSUPPLY's Reflectors (Liz W)
> 4. Re: AHSUPPLY's Reflectors (Vaughn Hopkins)
>
>
> -------------------------------------------------------------------
> ---
>
> Message: 1
> Date: Wed, 9 Feb 2005 07:11:19 -0800
> From: Vaughn Hopkins <hoppy1 at surewest_net>
> Subject: Re: [APD] AHSUPPLY's Reflectors
> To: aquatic plants digest <aquatic-plants at actwin_com>
>
> I don't have one of AH's reflectors, but from their website it
> seems
> that they consist of flat surfaces, not a parabolic surface. So,
> there
> is no exact focal point. I am going to make a version of what it
> appears to be, using wood and aluminum or stainless steel tape as
> the
> reflective surface (J.C.Whitney has stainless steel tape), and use
> it
> for a set of three parallel T8 bulbs. I think I can increase the
> light
> output from the two outer bulbs in the set by as much as 50% over
> what
> a single white painted flat surface behind the bulbs would give.
> This
> will be a subjective experiment since I have no means of actually
> measuring the light. With any reflector you can just look at the
> light and if you see a nearly uniform, but wide area of light you
> are
> successful to some degree. (Plus, look at all the fun you get by
> doing
> it this way!)
>
> On Tuesday, February 8, 2005, at 10:52 PM, Chris Hotte wrote:
>
> > Raymond Wong wrote:
> >
> >> Hi and thx everyone for their responses about the Ahsupply.
> >>
> >> But... Has anyone tried their reflectors with lights other than
> the
> >> ones
> >> supplied with AH Supply say t8,t5's t12's?
> >> Do you think it'll work since the cost is pretty good
> considering a
> >> 36" ish
> >> reflector from Ahsupply is $20 USD + shipping, I really can't
> find
> >> any other
> >> reflectors for about that price.
> >> But is this reflector for one tube or can I use it for 2 or
> more t5
> >> tubes?
> >>
> >>
> > After a short study on the subject, here's what I've come to
> > understand so far. The curved surface only works if the focal
> point
> > is used as a point of origin. It should give back a more or less
> a
> > uniform light distribution from it. The focal point is fairly
> obvious
> > and easily calculated with y=sqr(x)/4p, p being the focal point.
> It's
> > a good idea if it does in fact give back the %65 gain over
> rectangular
> > reflectors as stated at ahsupply. I for one cannot see why it
> > wouldn't. However, as you step your light source out of the
> focal
> > point, you start to loose the benefit and hinder it with bounce
> back.
> > So, trying to cram in more bulbs into a parabolic reflector
> would
> > effectively jam it up and put it back on par with a rectangular
> > reflector. I would even be willing to bet on the smaller the
> source,
> > and the more accurately placed, the more efficient the parabolic
> > effect. On the other hand, the limit to effeciency gained by
> > placement would have to be defined by the diameter of the curve
> and
> > size of the litght source.
> >
> > Of course, when everything is said and done, just play with it
> and see
> > what you get. *grin*
> >
> > http://usna.edu/Users/physics/mungan/Scholarship/ParabolicMirror.pdf
> > http://www.jc-solarhomes.com/do.htm
> > http://www.downeastmicrowave.com/PDF/dishfp.PDF
> >
> > Chris.
> > _______________________________________________
> > Aquatic-Plants mailing list
> > Aquatic-Plants at actwin_com
> > http://www.actwin.com/mailman/listinfo/aquatic-plants
> >
>
>
>
> ------------------------------
>
> Message: 2
> Date: Wed, 9 Feb 2005 17:09:09 +0100
> From: Dirk_Matthys at toyota-europe.com
> Subject: [APD] Re: Leaky Eheim
> To: aquatic-plants at actwin_com
>
> To my experience nothing beats "vaseline" as a cheap and available
> sourceof O-ring maintenance grease. I don't know if vaseline is a
> trade name or
> actual product.
>
> It is used for medicin type lubrication also. Doesn't dissolve in
> water.
> Dirk
>
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 9 Feb 2005 08:29:14 -0800
> From: Liz W <satirica at gmail_com>
> Subject: Re: [APD] AHSUPPLY's Reflectors
> To: aquatic plants digest <aquatic-plants at actwin_com>
>
> On Wed, 9 Feb 2005 07:11:19 -0800, Vaughn Hopkins
> <hoppy1 at surewest_net> wrote:
> > I don't have one of AH's reflectors, but from their website it seems
> > that they consist of flat surfaces, not a parabolic surface.
> So, there
> > is no exact focal point. I am going to make a version of what it
> > appears to be, using wood and aluminum or stainless steel tape
> as the
> > reflective surface (J.C.Whitney has stainless steel tape), and
> use it
> > for a set of three parallel T8 bulbs. I think I can increase
> the light
> > output from the two outer bulbs in the set by as much as 50%
> over what
> > a single white painted flat surface behind the bulbs would give.
> This
> > will be a subjective experiment since I have no means of actually
> > measuring the light. With any reflector you can just look at the
> > light and if you see a nearly uniform, but wide area of light
> you are
> > successful to some degree. (Plus, look at all the fun you get
> by doing
> > it this way!)
>
> IIRC, the beginning of this thread was someone asking a question
> as to
> whether installing these reflectors was a good way to raise light
> levels vs. investing in different bulbs, etc. I have an AHS retrofit
> kit installed and like it quite a bit.
>
> Their reflectors appear to be flat surface approximations of a
> parabolic surface. I have no doubt that measuring output with your
> eye, or at a particularly wavelength through a detector, will show
> increased light levels. What I do doubt is that after the light
> travels through 1 or 2 reflective surfaces (the surface of water
> in a
> tank and a glass cover if one is in place) that the light intensity
> will be much greater at a 3" water depth than it would be with a
> cheap, rectangular reflector. Better? Probably. Enough better to
> make a difference in plant growth? Don't know but I'd lean towards
> not a whole lot. As much difference in plant growth as installing
> better lights? I really doubt it.
>
> Liz
>
>
> ------------------------------
>
> Message: 4
> Date: Wed, 9 Feb 2005 08:50:04 -0800
> From: Vaughn Hopkins <hoppy1 at surewest_net>
> Subject: Re: [APD] AHSUPPLY's Reflectors
> To: Liz W <satirica at gmail_com>, aquatic plants digest
> <aquatic-plants at actwin_com>
>
> To be honest about it, I started my project to build a light
> fixture
> with the idea of saving money over buying something like the AH
> system.
> And, I might possibly do so, but it will be less than $10 saved.
> Now
> it is just a fun project, with the added bonus of avoiding the $20
> per
> bulb cost for CF replacement bulbs. The percentage of light lost
> to
> reflection at the water surface, reflection from the cover glass,
> and
> absorption by the water and cover glass will be the same for any
> light
> system, so that doesn't enter into it. The reflection losses at
> the
> reflector surfaces will be greater than with AH's excellent
> reflector,
> but now I am wondering why not use actual glass mirror strips for
> the
> reflector - that should get closer to the AH reflectivity. So,
> for me,
> this hobby is about the fun of DIY as well as the fun of growing
> beautiful plants. Being retired gives me the time for this, and
> it
> does keep me out of trouble!
>
> On Wednesday, February 9, 2005, at 08:29 AM, Liz W wrote:
>
> > On Wed, 9 Feb 2005 07:11:19 -0800, Vaughn Hopkins
> > <hoppy1 at surewest_net> wrote:
> >> I don't have one of AH's reflectors, but from their website it
> seems>> that they consist of flat surfaces, not a parabolic
> surface. So,
> >> there
> >> is no exact focal point. I am going to make a version of what it
> >> appears to be, using wood and aluminum or stainless steel tape
> as the
> >> reflective surface (J.C.Whitney has stainless steel tape), and
> use it
> >> for a set of three parallel T8 bulbs. I think I can increase
> the
> >> light
> >> output from the two outer bulbs in the set by as much as 50%
> over what
> >> a single white painted flat surface behind the bulbs would
> give. This
> >> will be a subjective experiment since I have no means of actually
> >> measuring the light. With any reflector you can just look at the
> >> light and if you see a nearly uniform, but wide area of light
> you are
> >> successful to some degree. (Plus, look at all the fun you get
> by
> >> doing
> >> it this way!)
> >
> > IIRC, the beginning of this thread was someone asking a question
> as to
> > whether installing these reflectors was a good way to raise light
> > levels vs. investing in different bulbs, etc. I have an AHS
> retrofit> kit installed and like it quite a bit.
> >
> > Their reflectors appear to be flat surface approximations of a
> > parabolic surface. I have no doubt that measuring output with your
> > eye, or at a particularly wavelength through a detector, will show
> > increased light levels. What I do doubt is that after the light
> > travels through 1 or 2 reflective surfaces (the surface of water
> in a
> > tank and a glass cover if one is in place) that the light intensity
> > will be much greater at a 3" water depth than it would be with a
> > cheap, rectangular reflector. Better? Probably. Enough better to
> > make a difference in plant growth? Don't know but I'd lean towards
> > not a whole lot. As much difference in plant growth as installing
> > better lights? I really doubt it.
> >
> > Liz
> > _______________________________________________
> > Aquatic-Plants mailing list
> > Aquatic-Plants at actwin_com
> > http://www.actwin.com/mailman/listinfo/aquatic-plants
> >
>
>
>
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>
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>
> End of Aquatic-Plants Digest, Vol 18, Issue 16
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