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That should be no problem. Use the power supply voltage at least 2V higher than the LED string forward voltage.
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That's an interesting idea. However I think your circuit would drain battery very quickly when the ambient is bright? Since it keeps Q3 continuously on when the sensor is lit.
That is great!I think this is something that many people are interested in (connecting more LEDs). I would be really nice if you can share the schematic.
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