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Re: Aquatic Plants Digest V4 #790
Are these bulds really fluorescent trying to look like incadescents?
Scott
>
> Date: Fri, 19 Jan 2001 13:58:32 -0800
> From: Richard R <email2me1 at home_com>
> Subject: Re: light bulb and tannins
>
> > > From: "Scott D. Goett" <sdgoett at ufl_edu>
> > >
> > > I tried asking these questions before but go no response, so I thought
> > > I would try again..
> > > I have 2 questions. One is about those twisty fluorescent bulbs that
> > > are said to have the brightness of a 75 watt buld but only use 20
> > > watts. My question is when you are calculation the watts per gallon,
> > > which number do you use? Are those bad bulbs to use?
> From: zxcvbob <bob at a51web_net>
> >You use the "20 watts" number, but you should discount it considerably
> >(25 percent?) because the manufacturers' numbers are overly
> >optimistic, and to account for the energy wasted by the intregrated
> >ballasts. .....................
>
> Scott, they mean brightness 75watt of Incandescent light bulb while it uses
> only 20watts. It's only to compare. So you use the 20watt number.
> Bob, you don't have to discount anything. Number of Watts has nothing to do
> with output of the light bulb.
> It is like this : P = U x I ( P= V x I in Canada ), Power = Voltage x Current
>
> sure i might be wrong :-)
>
> Richard