in an effort to cut heating costs I have deployed 3 x 250 watt metal halides over my tank. This approach seems to work well as my 3 x 300 watt heaters only seem to kick in for a few hours during the late night hours.
And you don't to connect those halides to the computer to get the "sweet spot". Some minutes of savings in computer's power too
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You wouldn't want to see my tank. I don't use fancy equipment and I am a noob