I'm wondering if he's inquiring if the power supply is unregulated. I can't remember, but if it isn't, he's asking if he'd drop to 15 watts per outlet vs. having 22.5 watts per outlet since he's not using two outlets. If memory serves me correctly, I thought those were regulated at 15 watts per outlet, so it wouldn't matter if he added two more or not, they wouldn't get any brighter or dimmer.