I have three Kessil 360 WEs over my 90 gallon reefer. I probably only need two, but I got a deal on the third. Kessils are 'plug and play" LEDs, and you can adjust the Kelvin from 10,000k to 20,000k. I've used halides all my life, and LEDs are like magic to a 63 year-old aquarist. Whereas my old 250 watt halides were like cinderblocks, the Kessils are the size of drinking cups and about the same weight. Weird. And the LEDs put out more light. I like the Kessils because they are so dang simple to use, and I'm pretty simple myself. HOWEVER! I have not seen the rapid SPS growth with the LEDs as I did with the halides. I almost went with Viparspectra, and I know LFSs which use them to grow out frags. They are very good, just not as compact as Kessils.