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Dick: For aquarium plant success, the internet aquatic plant gurus will argue that you can use less expensive "white" GE bulbs. One does not get the color enhancement of grolux, but the right wavelengths are there. Best to change bulbs at least annually. Nonetheless, I mix cheap GEs with Triton & CoraLife specialty bulbs and power compact fluorescents. All changed annually, except Tritons turn off automatically when output declines ... can last 18-24 months sometimes.
For indoor koi success, I know nothing!!
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