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With all the nuisance algae, the nutrients in the water will be low. So you'll need the low power (2 LEDs) to start, and, with the black shade screen in place.
Once the white surfaces are covered with brown or green, then the reflection of the light will be less, and you can remove the black screen. Then after growth gets thicker, you can plug in the high power.
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Inventor of the easy-to-DIY upflow scrubber, and also the waterfall scrubber that everyone loves to build:
http://www.reefcentral.com/forums/showthread.php?t=1424843
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