Take a peak at your ballast. If it's a workhorse ballast ( can operate within a certain wattage 10w-55w? ), you won't need to change it but if it specify only for a certain wattage ( 24w, 36w, 39w ) then you'll need to change it. I don't think you'll have a problem since both wattage are the same 55w.
Hope this helps!![]()
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