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From: firstname.lastname@example.org (Stephen H. Westin)
Subject: Re: Looking for 6v fluorescent power supply
Date: 16 Dec 2002 09:33:18 -0500
Organization: Cornell University
Sender: email@example.com (on ralph.graphics.cornell.edu)
NNTP-Posting-Date: 16 Dec 2002 14:33:49 GMT
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> Actually, I am building a highly portable short-wave UV lamp using a
> PL-S9W/TUV (9 W U-shaped CFL) germicidal lamp. I have cannibalized
> a 4W and 6W fluorescent lantern and both ballasts will drive this
> tube, but not at 9 W. The 4 watt ballast drives it at 1.8 W (300 ma
> @ 6V) which is the current draw when using a 4 W tube, and the 6
> watt ballast drives it at 2.1 W (350 ma @ 6V) which is the current
> draw when using a 6W tube. This seems fine for my application, but
> I would want to drive the tube somewhat harder, hence the desire for
> a commercial ballast.
> As to the AA cells, I really want the portability, and anything
> larger would be much heavier and bulkier. I would like this lamp to
> fit in my pocket. This lamp won't be used continuously. However,
> surprisingly enough, AA cells have quite a bit of capacity. From
> Energizer's web site, the Eveready AA Alkaline cells have a capacity
> of 2707 ma-hr. Using AA cells, I could probably get 4-6 hours on a
> set of batteries before the voltage falls below the firing voltage
> of the ballast.
Huh? 2.7 amp-hours at 6 volts would be 16.2 watt-hours; at 100%
efficiency and ignoring end-of-life voltage drop, that's a theoretical
maximum of 1.8 hours at 9 watts. Probably considerably less. Or have I
> This is highly acceptable. I can always use an external 6V power
> supply, but this reduces portability. I could also use 1600 ma-hr
> NiMh cells as well.
-Stephen H. Westin
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represent the position of Cornell University or any of its sponsors.
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