Not the case on my tank I run 2 400 watt 20k's and i can tell a big difference when the 4 110 watt vho super actinics are burning.glxtrix;315524 wrote: Exactly....If you run 10K or so, you'll see the extra pop in the corals...but don't expect them to produce a 20K feel. If you run 15K and up, you'll not really notice anything.....until the lights go off.