Tropical Fish Keeping - Aquarium fish care and resources

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qpc68 09-09-2008 10:47 AM

Lighting Question
I have a hypothetical question. I'm not sure exactly how to phrase it, so I'll ask it through an example. Part of me thinks it's a stupid question, but I want to be sure.

Let's assume that for the plants in Tank X, the ideal lighting is 100 watts for 8 hours a day. Assuming all other variables are equal, would the plants recieve the same benefit from a 100 watt light for 8 hours a day as they would from recieving 50 watts of light for 16 hours a day?

The reason I ask, I'm fiddling with the length of my light cycles, trying to find the right balance, and wanted to know if using half the power of my lights for part of the day truly equals half the benefit to the plants.

To rephrase it another way, is using half the wattage for 2 hours equivalent to using full wattage for 1 hour?

Thanks in advance for any help.

onefish2fish 09-10-2008 12:21 AM

no, the amount of time the lights are on with half wattage does not equal half that amount of time with full wattage.

you need aprox. 2-3 watts per gallon (depending on plants lighting requirements) with some kind of Full Spectrum light bulb(s)

qpc68 09-10-2008 09:48 AM

What I figured. Thanks.

klosxe 10-07-2008 10:32 PM

Agree with the second post. Good answer!

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