It has been pointed out to me on ECW that the 55W rating of the bulb is LIGHT power (tungsten equivalent?), not ELECTRICAL power, so the COP is unknown.
Just a thought, nos specifically directed at current events, more of a general observation. If someone claims that has a device that produces light with a COP of let’s say 10, I immediately think that the device can be tested putting it in front of a relatively good quality solar panel (efficiency of conversion around 20%) and make it self sustaining.
If the claimant doesn’t make this kind of obvious test, then the claim seems weak, at best.