Wow, cool! I take it back, then :) Would i be correct in thinking that this probably makes it less useful? Current thermal collectors use absorbent coatings

Wow, cool! I take it back, then :) Would i be correct in thinking that this probably makes it less useful? Current thermal collectors use absorbent coatings that are "full-spectrum," with a minimum of IR emission, which i have to imagine contributes to their really high efficiencies.