It really depends on the gauge of wire in your atty. The lower gauge the wire, the more power you need to reach the temp range for a proper vape. For 26 gauge wire, I find 16-17 watts per coil is my sweet spot. For 24 gauge, more power is needed (I don't think 40 watts is enough in my RDNA 40 for a good vape on 24 gauge dual coil set ups). For lower gauge, you can get away with less power.
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