I can tell you the answer to that. I have two Jebo's with 4x55w in each. They come with a 10,000k and a "intense blue" bulb. The 10,000ks are great. On the otherhand, the intense blue bulbs are horrible. The create a green cast in your tank, it appears almost as if you've been over run with alge, and your purples are hardly noticeable. I got 2 55w .03 actinic bulbs from Blue Siearra for $25.00 each and what a world of difference. Still cheaper than others. Good buy. Also be careful as they have no cooling fans. All in all, worth it.