this was done by a company in Alberta,late 90's early 2000's, except burning diesel, same idea of tuned photovoltaics outside a quarts cylinder,where a flame was buring @ one specific coulor temperature, they were marketing an initial model for sailboats, and had working devices in service.
published efficiencies wrre also 40%+
lost track of them and could not find again
this effort uses excited sodium,though there will
be a number of other possibilities
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