The lamps provide two main benefits. The first, as you might expect, is light! Close to the equator it gets dark not long after 6pm, so light from solar lamps is essential for studying and socialising in the evening.
The second benefit is income. The solar lamps can charge mobile phones, which is a profitable business in areas with little access to electricity. The lamps can also be hired out and save money compared to the cost of buying kerosene fuel for traditional lamps. The income enables recipients to repay their lamps over a period of six months, to ensure that someone else can receive a lamp upon repayment.