My first LED venture for a 10g was successful but I used a kit with everything included. Except for picking wrong temp LEDs it has been working great for almost a year for a $28 investment. My next venture is for a 20h. My problem is the LEDs I have picked are 700ma and the drivers I can get for what I am willing to pay are 350ma, 600ma or 1000ma. Am I correct thinking I can use the 600ma driver? Could the 1000ma be used with a resistor?