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Yup! A coworker of mine has one of these in a desk lamp over a low-tech 10 gallon and is growing plants like crazy. Depending on the depth of the tank and how many you use, I'd say you'd have good luck with it.
 

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Discussion Starter · #3 ·
That is good to know. I thinking thinking of growing Amazon Swords and some java ferns. The tank is quite deep, (20") but the swords are tall, so more like less than 12" to the leaves. Thinking of putting one of this with reflector on top of each swords.
 

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You can see by looking at that photo that less than half of the light output ever gets out to a reflector or directly to the tank. The spiral is so tight that most of the bulbs output just gets scattered inside the coil. But, it is a relatively high wattage for that kind of bulb, so a few of them could be effective, if not efficient.
 
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