How one can say about a device (e.g: a light holder contains 20 or 30 L.E.Ds w

How one can say about a device (e.g: a light holder
contains 20 or 30 L.E.Ds which glows when power supply is
off, from which source they are getting the supply.....
battery or capacitor) without removing and opening up its
case ?

Question Posted / dineshdesh

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How one can say about a device (e.g: a light holder contains 20 or 30 L.E.Ds which glows when powe..

Answer / beaconguru@gmail.com

capacitor only for short time operation.if u want to glow long term battery is preferable.

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