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HI Prasad You will need a power supply with a 9 VDC (9 volt DC) output instead of a 5VDC output like the one I used. I don't know how much amperage your water level sensor draws, but a 1000mah 9 VDC power supply should be good. Fortunately, these are easy to source. Here's one on Amazon: https://www.amazon.com/PigHog-PP9V-Power-1000ma-Supply/dp/B00JU9V7I6/ref=sr_1_9?ie=UTF8&qid=1490184065&sr=8-9&keywords=9+vdc+power+supply Get one like this, cut the connector off, separate the positive and negative wires, and connect this to your water level sensor in lieu of the batteries.
Hi Anthony. Do you know if your light uses LEDs? If so, it's most likely 5 volts, so use a 5 volt charger.
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