getian

So I have 2 areas, 12ft2 & 8ft2. I want to run em the cheapest way possible, while maintaining at least 160+ lm/w efficacy. Thinking... [8] Getian 2828 @37.5w ~170 lm/w [11] Getian 2828 @41.0w ~160 lm/w [1] 480h-36a To the point of the thread, has anyone used a relay, timer, resistor circuit...