[ninalanyon]

Energy efficiency is far from the only number that matters. Unless you are that rare person who is talking about total life time cost in energy terms.

You have to consider the cost of manufacturing, the cost of disposal, the cost of maintenance, possible externalities such as pollution of the environment, etc.

[gus_massa]

I agree, the molecule looks super tasty for bacterias. I guess any bacteria contamination would transform it into a green goo in a week.