# Re: [APD] Welcome to the "Aquatic-Plants" mailing list (Digest mode)

```Oh, what Imeant was watts per gallon, which means watts/gallon. Aquarium volume is the denominator and rated bulb watts is the numerator.

If the example is 80 watts over a 200 liter aquarium, that equates to about 80 watts per 5.284 gallons, which equates to about 15 watts per gallon.

80 watts over a 5 gallon tank is a lot of light.

If it was a 200 gallon aquarium, that would be less than half a wpg; 80n watts is not a lot over 200 gallon aquarium, in fact, it's downright dim.

Scott H.

* * * * * * * * * * * It's new; it's fun; it's the New England Aquatic Plant Society NEAPS, is a newly formed organization interested in aquarium flora and fauna. http://www.ne-aquaticplants.com/

----- Original Message ----
From: Stuart Halliday <stuart at stuarthalliday_com>
To: aquatic plants digest <aquatic-plants at actwin_com>
Sent: Friday, January 27, 2006 12:35:17 PM
Subject: Re: [APD] Welcome to the "Aquatic-Plants" mailing list (Digest mode)

I believe S. Hieber wrote this email section below:
> Wise comments, but I will eleaborate a bit more.:
>
> "Watts per gallon" is a technique for estimating lighting levels. You
> take the reated watts of the bulbs over an aquarium and divide by the
> nominal volume of hte tank. The estimated watts-per-gallon that you
> compute this way allows you to work towards a target level of lighting.
> What's the target? There are diff ones depending on goals, plants,
> conditons, variations in equipment and gardening techniques. But these
> rules of thumb will serve just abut everyone well.

Gosh.

I've got a 200L tank with 2x 40W bulbs so that works out at

80/200 = 0.4!

sure you don't mean 200/80? Cause that makes 2.5

BTW, what is 'reated watts'?

--
Stuart Halliday
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