Sun's charging my lamp so fast!

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We bought a solar chargeable lamp of Sunking almost one and a half years back. Some friend of my uncle was selling them, and we bought one. The lamp doesn't heat up when on, has a thick case and is almost unbreakable. It has 3 stages of power: you can click on the button repeatedly to increase the brightness. I've been using it at night and it goes very easy on the eyes. The lamp proper is also detachable from the stand, so I can carry it with the elastic band attached to the back, in my hand if I go out in a dark environment. The amazing part is that it is charged by a solar panel which came with the package. A charging jack with a wire connects it to the panel. So during daytime I can put it out under the Sun, it charges slowly, and after 2-3 days of uninterrupted daytime charging I think, the battery becomes fully charged. It lasts for a little more than 10-12 hours. Quite easy to setup, isn't it? The lamp also shows the intensity of sunlight at the back with 5 markings, so we can estimate at what rate the battery's charging Just now the battery charged from 2nd to 3rd marking! This is a wonderful product we had purchased and it didn't even cost much. I think it was about Rs. 350/- . This product comes in different sizes too. At times of power outage, it is of great use. Usually electricity charged lamps available here don't last very long, but this one seems like it will deliver its promise for years to come! I'm a big supporter of using renewable energy. I dream that in future, the humongous electricity consumption can be replaced at least partially with these and thus save on both our world resources and cost, while proving to be very efficacious. I dream for a better world. What do you think?