The SM100 is a brand new solar light that has been developed especially for SolarAid by Yingli Solar. Designed for off-grid families and school children, the SM100 is an ultra-affordable, tough solar light for all applications. "The world's most affordable quality solar light," has an end cost to buyers in Africa of just $5. The SM100 retails for £10 in the UK, where sales of the solar light will help to underwrite the distribution of two more SM100 lights in Africa for each one sold in the UK.