02-27-2008, 04:11 PM
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We have these in our shop and they are great for planted aquariums. I'm not sure what your budget is, but if you can buy a 4 x 65watt light fixture just like this, then you'll get 100% more light for only 50% more of the cost.
With the light that you have suggested here, you will only be getting 1.73 watts/gallon. Now depending on the style of your tank (i.e. it's height), this may be good, but for a standard 75 gallon, this might be a little weak-sauce. If you invested just a little more money for a 4 x 65watt fixture, you'd be getting 3.46 watts/gallon which is enough to grow almost anything (and damn near corals if you had saltwater!) with brilliance.
It really depends on what else you have. If you had 5 inches of nutrient-rich substrate, made a tri-weekly dosage of fertilizers, bi-weekly water changes, and had some intense carbon dioxide system attached to this beast, then I would say yes, this lighting is sufficient.
If, on the other hand, you only had an inch of silicon synthetic rock, dosed maybe once a month, changed the water once a month, and lacked a carbon dioxide system, then this lighting is probably just a waste of money.
It's a delicate balance and no one factor can determine whether or not you will succeed in growing beautiful plants.