Go straight for 4x24W.
There are reasons for the high costs.
One consideration is the individual parabolic reflectors. If you look at the other cheaper alternatives, they are without parabolic reflectors. Even the retrofits will come to near that pricing.
Plus, their design is good and allows easy maintainence of the tank with their flippable stand design.
Don't think there are any other brands with black casing already.
It is worthed the price and I am loving every bit of mine.
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