Sri Lanka on the BBC World Challenge short list again

A few years ago it was the elephant paper project, now it's the safe kerosene lamp project. Makes for an interesting comparison with D.Light. On one hand you could say D.Light leapfrogs the issues such as continued reliance on kerosene, fumes, remaining probability of fires; on the other the bottles would be cheaper to produce/sell/sponsor/distribute and require almost no behavior change.