Benzelsanswered grow question 2 years ago This is why I grow Photos. 12/12 for flower uses much less power. And I still end up with more bud than most Auto growers.
I guess your options are a smaller light and less yields or switch to photos and try to get more yield than your getting now and hope the 12/12 in flower makes the power bill cheaper enough to all work out in the end. If you can get more yield with 12/12 with photos, using cheaper but still good seeds, at least the cost per gram of weed will be a bit lower than now.