Hi Erik, I use these bulbs from Wal-Mart: http://www.walmart.com/catalog/product.do?product_id=10448675 in my 10 gallon with 2 sockets and they work great. That is the tank where I am growing the Nymphoides sp. 'Taiwan' (see pic below). They have a spectrum of about 6700K and Wallyworld is the only place I have found them. I have had mine in operation for about a year and a half and they are still going strong. Roy
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