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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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