I have had a dimmable DIY 55 Cree LED system up and running for about 3.5 wks and my colors are popping along with much better growth! I started with running them at 55% for the first week, increasing 5% each week. Now they are at 70% for whites/high noons and 75% for blues. I have always had problems getting my blues/purples to come out even to the point i thought i had this simple purple encrusting monti, nothing special, with the new lights it's looking like Purple Haze! My dull green digi has become vibrant neon green. I am also seeing much better PE. I couldn't be happier!