There will be some adjustment for your eyes and expectations. At the risk of this thread turning into a giant debate, I'll just casually mention. Kelvin rating has become largely subjective. I'm sure someone may show up and provide some scholarly article outlining it, but there are objective criteria for assigning a kelvin rating. The challenge is you can have lots of combinations of wavelengths that create 20k, but they'll look visually different. Kelvin ratings are basically a numerical average. You cannot assign a kelvin rating based on visual appearance. Everybody's perception is different.
I use 14k mh bulbs. If I come in from outside, the tank will appear super blue, but if I'm watching tv in a dark room, I perceive the tank as super white dare I even say a little yellow. Perception will dictate how your brain reacts to your tank.
A 20k setting on an eco tech radion will look absolutely nothing like ATI's 20k bulb recommendation, which won't look much at all like a Hamilton 20k mh bulb. Trial and error will really serve you some good.
Long story short. A "œ20,000k ATI recommendation" will probably be visually a lot more white than most led manufacturers "œ20,000k" preset. You'll just have to get used to it. Even running ALL ati blue+ will probably be whiter than what you're used to with leds. It's the green spike from the mercury vapor in the bulb. You can't get rid of that. It is what it is.
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