Well, if it’s an efficiency-based standard, this new technology would not be against the law.
The key here is that it isn’t a straight black-body radiator—non-visible radiation from the filament is used to excite photons in the visible range from the surrounding crystal.
Very cool (or hot, if you like).
It is an efficiency-based standard.
Actually the filter/mirror is constructed by vacuum deposition of many alternating layers of materials. The thickness and composition of the layers allow tuning the mirror to pass or reflect light based on frequency. (Dichroic Filter)
The incandescent filament produced about (5-7)% visible light, the remainder was pure radiant heat. The filter/mirror passes the visible, and recycles the heat back to the filament. The heat reflected to the filament replaces electrically produced heating, reducing the electricity necessary to make the filament glow.