Re: [AGA Member] how many wpg is the sunlight?

[Dave Wilson <rwilson@octa4.net.au>]

Hello Aviel
Try tropical sun (where I live ) at midday being somewhere between 110 and
150 thousand lux.   Stick that one in your calculations and try again.    I
have taken light meters to my favourite plant growing creeks and obtained
light measurements at the waters surface ( under some shady trees) of
between 6,000 and 19,000 lux.   The shade house where I grow aquarium
plants, the readings at mid day are 40,000 lux and all the plants grow
really well.  If you can convert 150,00 lux to WPG I would love to know the
answer. (maybe times 5 your estimate or 13.5 WPG)   It is always very hot
here as I imagine it would be on the Amazon River.   The natural waters here
are about 26 - 32 deg C most of the year.

Cheers
Dave
Darwin NT


On 7/4/2004 15:16, "Livay Aviel-R51374" <Aviel.Livay@motorola.com> wrote:

> Yes - you heard me right... :-)
> 
> Or maybe I should rephrase my question -
> If I put the aquarium in the middle of the amazon river, and it's day, no
> clouds - I get some light intensity over the surface of my tank. Now how many
> Fluorescent Watts should I provide to get the same intensity?
> 
> I know Lumens and Lux are not the right thing to use but still - I read
> somewhere that the sun is 30,000 lux. I think a good 36W T8 Fluorescent is
> ~2500 lumens. If I have a surface area of the tank of ~1.25 square meter. Then
> that's 2000 Lux per Fluorescent. So 30,000 / 2000 = 15 Fluorescents.
> Multiplied by 36W gives - 540W and divide it by 200 gallons = 2.7 wpg.
> 
> Too low I believe - so this is why I am asking...
> 
> Aviel.
> 
> 
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