Efficiency no, but: "The effect can be substantial. Under the optimum conditions of color, angle, and polarization, Lv says, “the evaporation rate is four time

Efficiency no, but: "The effect can be substantial. Under the optimum conditions of color, angle, and polarization, Lv says, “the evaporation rate is four times the thermal limit.”" So, up to 400% efficiency compared to temperature. Drying brine would probably be best usage.