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Re: [APD] Re: Power Compacts
Date: Tue, 07 Dec 2004 13:27:45 -0500
From: Bill Wichers <billw at waveform_net>
Subject: Re: [APD] Re: Power Compacts
To: aquatic-plants at actwin_com
If they're waterproof fittings and fixtures, sure. If not, that >90% humidity
is gonna play hell, albeit possibly eventually.
Another reason for a cover glass: it is much easier to clean mineral
deposits off of a flat piece of thick glass than several round pieces of
thin (and more delicate) glass.
The bulbs don't need a cover glass, and I don't think water proof fittings
are a necessity either (and remember that I am a champion of electrical
safety :-). The problem is that without a cover glass you'll get mineral
deposits on the bulbs over time that will be difficult to clean off, and if
you use non-sealed connectors then you'll get corrosion on the contacts
that will eventually be a problem. I don't trust any "water proof" light
socket though since none of them I've ever seen actually seal properly
after they've been in use for a while.
Using a cover glass is easy and cheap, and it will protect the much more
expensive bulbs and sockets, as well as making maintenance easier. I think
it's worth it for these reasons alone. IMHO, ballasts should always be
remote mounted anyway so that's not a concern. Those using open-top tanks
will normally have their lights mounted higher above the water surface and
will have less problems with mineral deposits and corrosion so the cover
glass is less of an issue in that case.
I don't see mineral deposits as an issue in most planted tanks. Unless
you have an incredible amount of splashing, the white you see on most
cover glass is actually dissolved and redeposited glass components from
the etching by the distilled condensate (initially with no minerals at
all) on cooler parts of the glass, subsequently flowing to warmer places
and then redepositing mostly SiO2. That will never happen on warm tubes.
It cannot be scraped or cleaned off with the usual acid cleansers, either.
Otherwise I agree with your conclusions and advice, and I, too, prefer
protecting the expensive illumination goodies with cheap sacrificial
glass for most tanks. [Raised high enough, the lamps are so high they
light up the room and waste precious "Einsteins" on the carpet (which
usually refuses to grow).]
BTW, well-fitted glass keeps any redidual CO2, lost from the reactor, in
intimate contact with the water. Waste not want not.
Wright Huntley - Rt. 001 Box K36, Bishop CA 93514 - whuntley at verizon_net
"France has neither winter, nor summer, nor morals. France is
miserable because it is filled with Frenchmen, and Frenchmen are
miserable because they live in France." --Mark Twain
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