Here’s a new video published by Brilliant Light Power on YouTube. The video description states:
Time Lapsed, One Hour Duration Steam Production Run POWERED BY THE SUNCELL®
The SunCell® was submersed in a 120 gallon, vigorously stirred water tank that was initially at room temperature. The SunCell® internal temperature remained steady at about 400°C which is a typical operating temperature of a steam turbine power plant. The run duration was limited only by the thermal tolerance of the water tank.
Unfortunately no data is provided about energy input or output (although showing boiling water does help), so no COP can be calculated. I hope that information will be forthcoming)