And although the experiment got more energy out than the laser put in, this did not include the energy needed to make the lasers work - which was far greater than the amount of energy the hydrogen produced.
Confused! So I guess the lasers delivered less energy than was produced, but the total energy consumed was less than that produced, so a nett loss and not worth the energy cost atm.
https://www.bbc.co.uk/news/science-environment-63950962