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So right now im running 3 halides at a combined wattage of 550 watts and i want to switch over to leds i was wondering how many would i need? Not use to this led thing
Generally, you will need 3 fixtures. Like halides, most LED fixtures (that are worth while) are good for about a 2 x 2 area easily. Some have optics that decrease the spread and increase the potency, and others do not, making the footprint larger, but less powerful.
What do you want to spend?
Those are good lights. I just got 2 in for my 55 gallon. They come from china, and take about a week regardless of what the sipping estimation says.
But anemones love the new lighting! Plus they are easy to install, took me about 15 minutes.