From what I understand with the units that have dimmer knobs is you have one intensity all day and night don't you? And then they go off. I enjoy tinkering with the programming feature on the Evergrow from time to time, it's digital so you know exactly what percent you're at for each channel. at 1130 pm the lights are programmed so just the blues and UVs are on so everything fluorescent glows and my house isn't flooded with intense tank lighting anymore. At midnight the moonlights come on and it's just subtle. Same thing in the morning, slow ramp up
The sun changes intenesity on corals throughout the day, so why not have lights that do the same.... If price is a factor then that looks like a pretty big difference! So guess just depends on how much you'd like to spend.
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