I'm talking about those pucks. And from what I've read, just the white ones will do. Back 4 years ago when the 1w LEDs were bright (LOL) 7 of those suckers beat a 7w PC bulb on a small tank to shreds. If anything a few blues would be great for plant growth (though, not toward the actinic side). remember, the best light for plants is more purple than anything.