Can we start a referral program? I may have a few people I want to direct to buying from you

I was thinking about that today. How do you think it should work?
7 days of double your power for each person you refer... I have 1 so far I referred to you that purchased..
Better idea.. 1 Day of double your power for each gridspeed sold that you referred.. So for example if you refer someone that purchased a 10 pack, you would get 10 days double your power as a referral bonus.
Easy, measurable, and a nice incentive to refer..