optimizing with ladybug and galapagos

Hi,

I am trying to generate a building mass using environmental analysis with ladybug. I basically need the building to react to two parameters - minimum radiation and maximum sunlight hours. Instead of optimizing one parameter and then based on these results test the other parameter, I want to know whether any of you have an idea on how i can test both these parameters at the same time? can anyone suggest a formula or equation that can evaluate this kind of thing?

thanks