0.5% efficient, but they're old lasers. Equivalent modern ones are over 20% efficient. Also, with their first Q>1 shot they increased the laser power 8% and go

0.5% efficient, but they're old lasers. Equivalent modern ones are over 20% efficient. Also, with their first Q>1 shot they increased the laser power 8% and got 230% more output. They think the nonlinear scaling will continue for a while. If they're right, then they're not actually that far from overall net power, if you correct for the obsolete laser tech.