# Does quantum yield of reaction factor in number of electrons needed?

Can someone tell me if quantum yield of a reaction factors in the number of electrons needed to create the particular species? If not, is there a metric that does?

For example, I have a 4 electron reduction which means that even if I have 100% efficiency, my quantum yield is

$$\frac{\text{# molecules reduced}}{\text{# photons absorbed}} = 0.25$$

Is there a better metric I can use so that 1.0 will be 100% efficiency?