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CFL 100w 23w which is it for the WPG rule

462 Views 1 Reply 1 Participant Last post by  tjurhs
Hi guys,

I'm trying to determine if I have too much or too little lighting? I know there's all kinds of tech head stuff about it, but my lightbulb of understanding has not yet turned on.

So I went to Lowes and got a 5000K and a 6500K 23watt light bulbs that are supposed to put out 100watts each. And my tank is a 10gallon tank.

With the two CFL bulbs rated at 100watts, I get (100watts + 100watts)/10gallons and I have a 20WPG, and that's waaaay to high!


With the two CFL bulbs rated at 23watts, I get (23watts + 23watts)/10gallons and I have a 4.6WPG, still alot, but maybe ok?

maybe I need to get the 13watt bulbs?

or is it that they each produce around 1500 Lumens and that's what I should be counting?

can someone help me out with this, or at least let me know how (in a fairly low tech manner) get in the right ball-park?

Thanks much!

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