ubiquinone-8 + NADPH + H(+) = ubiquinol-8 + NADP(+)
ubiquinone-8 + nadph + h(+) = ubiquinol-8 + nadp(+)
ubiquinone-8 + NADPH + H(+) = ubiquinol-8 + NADP(+)
ubiquinone-8 + nadph + h(+) = ubiquinol-8 + nadp(+)