That depends on what you have in your tank. This is a big question where you basically want to research your aquarium inhabitants and build an environment where the light, current, tank size etc are what they need to thrive.
Higher light will benefit many corals, but some may react poorly in the short-term to an immediate doubling of the light output. If you have corals that you are not sure about, keep the new, brighter hood a little higher off the top of the tank for the first week. But really the amount of light you are pumping into the tank is more, but the intensity of light is about the same - In your typical hard-soft coral mix of well known species there shouldn't be a problem with switching the lights directly.
Good Luck
Stephen
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