Big Bud Autos 2m 30cm tall?

They look like they stretched a bit... but, it is possible that autos turn out to be photos... from reputable breeder this should be <1%. 7-8 weeks.. hmm, unless it is a true XL auto, this is too long for a typical autoflower, yes. Can do some HST-Supercropping to reduce height... basically, pinch/fold a stem, then tape it up and otherwise support it in horizontal position. So, you may have some photoperiods, sadly... if a 10+hour dark period causes bloom, you will need to maintain that schedule until the end, as it is a photoperiod. (12hours darkness is safer as there is variation... i'd go 13on 11 off, though, because you are using a light you expected to have on for 18-20hrs a day... the plant will be getting 33% less light over 12-13 hours, so it is worth pushing beyond 12-12 to recoop any bit possible) if you can, add another light... need more over fewer hours to equal what you were providing before.