Similarly, the poorest fifth receive 0.1% of the world's lighting but pay a fifth of total spending on light, accounting for 25 to 30 percent of their income. Indoor air pollution from burning fuels kills 2 million, with almost half the deaths from pneumonia in children under 5. Fuel from Bamboo burns more cleanly and also matures much faster than wood, thus also reducing deforestation. Additionally, using solar panels is promoted as being cheaper over the products' lifetime even if upfront costs are higher. Thus, payment schemes such as lend-to-own programs are promoted and up to 14% of Kenyan households use solar as their primary energy source.