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I would get a HPS/MH switchable light and ballast.....
Mh is great for veg, but HPS will also work. But if you have an option, go the MH.
Then it's a simple switch of bulb when you go into 12/12 with the HPS.
As far as light leaks, light is light - doesn't matter if it's MH blue/white light or it's the HPS orange/amber light. Both are bright and need to be hidden the same. Although the HPS can penetrate through different materials better than the MH.
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