Help making a high powered RGB Lighting system for my highschool

Using Arduino Project Guidance
20

http://www.xppower.com/pdfs/SF_LDU.pdf
This one, showing 1.25V

PWM
Output Current Range • 25% to 100%
Operating Frequency • 1 kHz max
On Time • 200 ns min
Off Time • 200 ns min
Amplitude • 1.25 V max <<<
DC Voltage Control
Output Current Range • 25% to 100%
Control Input • 0.3 to 1.25 V max <<<