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I have heard LEDs are far more efficient than halides, but perhaps that is a rumor? I have seen a few grow bulbs lit by LEDs, supposedly they enhance growth better as they only emit blue and red wavelengths.

Here's an old article about LEDs for night time viewing for a fish tank
For big tanks, I think it'd be more practical to use a 13 or 9 watt actinic blue cf.
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