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It shouldn't, but if you are that concerned you can leave them on, or only turn on one of the bulbs. Leaving them on for too long could cause an algae bloom if there are high nutrients in the tank.
What kind of lights? If you have the choice between VHO and MH, leave the VHOs on, and shut the MH off... it would be "dim" in the tank, but wouldn't hurt anything (IMHO)
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