Daytime
1. 5 minutes of direct sunlight, placed indoors, close the curtains to use.
2. Open the curtains and place it on the window sill. 15 minutes in the sun, close the curtains and use it.
Nighttime
1. Place it under the indoor LED light, irradiate it for 30 minutes, turn off the light and use it.
2. Place it under the LED desk lamp (within 10cm distance), irradiate it for 20 minutes, turn off the lamp and use it.
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