Don't worry about the '10000 suns' requirement... The High-Flux Solar Furnace "can nominally provide flux at 2,000 suns but, when required, can use specialized

Don't worry about the '10000 suns' requirement... The High-Flux Solar Furnace "can nominally provide flux at 2,000 suns but, when required, can use specialized secondary optics to generate concentrations greater than 20,000 suns." -- http://www.nrel.gov/docs/legosti/fy97/23377.pdf http://www.nrel.gov/docs/legosti/fy97/23377.pdf