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All fluorescent bulbs are energy saving bulbs. They produce 10X the light that an incandescent bulb produces. But, we mean fluorescent bulb watts when we talk about watts per gallon, not incandescent bulbs. So, you are already using energy saving bulbs. If you want to save your parents electricity costs, switch to T5 bulbs with individual reflectors. They will save up to about half the wattage of other fluorescent bulbs. (Always beware when someone tells you you can save up to some value! That means that is the most you will save, but the least is zero.)