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Advice on an emergency lighting circuit design?

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I am designing an emergency lighting control circuit recently. I came to this post as in


This design looks reasonable, but I would like to do two changes:

1. keep the LEDs on while AC is there, and dim the light to some extent (LEDs remain on with battery power) and light up a warning LED when AC is out.

2. I don't like the 1000uF capacitor in line, since this circuit is meant to be working for long time. Will you recommend some AC-5V DC regulators ( say 5-20VAC input optional)?
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