I used the Boost LED Par 30 (5 3w LED's vs 7) with the gooseneck mount on my JBJ 3 gal pico. It was plenty of light. I think 21w might be a little much.
I use a Ecoxotic Panorama Pro (19watts, 12k/453nm combo) on my picotope and think it's probably a little too much light. Everything has survived and grown and looks pretty good though. Setup has been running like this for a year now.
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