WPG?

[Jim]

How does watts per gallon work?

I'm very curious  

Thanks
JIM bo

[BigDaddy]

Take the total watts of light you have over the tank and divide by the total gallons of water.

.5 to 1.5 WPG - Low light
1.5 to 3 - Medium light
above 3 - High light

Certain plants need certain light requirements.  WPG is a rough guide.

[Jim]

ok thanks

[dpatte]

WPG rules refer to flourescents. if you have incandescent, count their watts then divide by 3 first.

[kennyman]

I have read another formula that seems a bit too complicated, but i'll give it shot and see what you guys think;

30-50 lumens per liter of water

55g  (55x3.785) = 208 L  

somewhere between 6240 and 10400 lumens for that tank.

The packages probly say lux, which is suposedly just a lumen measured on a 1m surface. Like I said its kinda over done, but I supose it puts the differnt light sources on more equal ground. Not to say they put out the same spectum at all.

Gosh I'm bored tonight . . .  . I better go scrub diatoms