Initially, this flower bulb needs 4-6 hours to charge. But it works without initial reload when the circuit is active. After charging and in the event of a power failure, the light will be on immediately. It uses a rechargeable battery. The light will not be as bright as when the circuit is active, but this is normal. It's way better than nothing. If I happen to read, I can read on. No need to run upstairs and flip a switch. According to the instructions, the battery lasts 3-5 hours. Didn't take me that long, but if I did I'd try to charge more than one lightbulb.
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