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1x Kessil Spectral X Controller - $50 + shiping
Get the whole package for $275
These two Kessils work well and have been on my 90G at 40% color and 50% intensinty. One of them was purchased used in early 2021 and is of unknown age. The second I actually bought brand new less than a year ago when I found it in my LFS clearance bin.
!!!IMPORTANT!!!
One of these is putting out light that is slightly different color than the other. I am unsure if it's the older or the newer one doing that as I can't tell them apart. Similarly, as i only have these 2, I don't have a third to compare to so I don't know which one is actually "malfunctioning." They still worked well for me as I only really noticed it when the tank was ramping up or ramping down, when the blues were very intense. I've priced them cheap due to this issue. I tried to capture to effect in pictures below but it's really difficult to see with a cell phone... in the bluer light photo you can barely tell there is a difference, but in person, you can see it. With the lights on whiter, I don't notice much of a difference at all.
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