>How much does abysmal efficiency matter...? Serious question. Serious answer: Supplying sunlight isn't what's driving cost here. The problem is that ineffici

>How much does abysmal efficiency matter...? Serious question. Serious answer: Supplying sunlight isn't what's driving cost here. The problem is that inefficient systems need to be large, and enlarging systems (even 'simple' ponds, etc) makes them more expensive.