Are these lights sufficient enough to get a harvest at all?

im not looking for a huge harvest but im obviously not going to waste my time on something that wont get me high at all lol anyway back to the point i have 2 cfl's one 15 watt and one 26 with a combined amount of 2400-2500 lumens will it be enough to grow my plant through a full life cycle? (i just want to make sure everyone knows i am not expecting a amasing harvest not even a really good one even 10 grams would be enough) i have ak49 auto flowering seeds

In my view, anything less than 100 watts (of the right spectrum) is a waste of time, unless you're a super casual smoker. I wouldn't be happy with less than a gram's worth per week, which is what you're aiming for with a total harvest of 10 grams after a 10-12 week grow cycle.

If you're a 'couple joints a week' kind of person, then yeah, 10 grams should last you a couple months.

Otherwise, triple your lighting to 100w of 2700K during flower, and aim for an ounce on your first run. If you do some research into how to raise a plant, you should be fine.

what sunnyjim said, at least 100 watts to get started. good luck.

My first grow yielded 10 grams using about twice the amount of lumens you have there and I also had issues with soil and temperature so I'd say 10 grams could be doable with what you got if you don't have any other problems.
You could easily double your current lighting for under $20 by getting a couple Y splitters and two more 23/26 watt bulbs or just get a couple 42 watt bulbs($10 each) that put out about 2500 lumens each. I'd be pretty confident in saying $20 more dollars invested in lights would get you your 10 grams.

Invest in a 150w HPS. That'll do for probably two medium to small sized plants with a fair yield.

I maybe crazy but I can't seem to understand y u would even put any effort at all into growing for a 10g harvest?
But uve heard the ol sayin to each their own so if 10g is what ur after I hope u succeed
If it was me I would add at least a 6pk 23w 2700k utilitech bulbs (seems to be more bang for ur buck) at $14 which would put u up to 12,100 lumens and if u don't like y splitters(IMO best lightin accessory ever created for this) they make sockets that plug directly into outlet and take 2 surge protectors put 3 on each with 1 outlet between each bulb leave the 2 u have above plant put surge protector fixtures on each side and ull laugh at 10g but 150w hps works good also retired mine for awhile to try cfls my current personal setup is 16 cfl of brand and wattage named earlier + 100w mh which puts me around 30,000 lumens as long as I keep lights 1-2" above colas and Ive almost decide not to go back to hps as I've worked out a setup to give almost each individual bud it's own 23w cfl with the mh for canopy penetration and I'm extremely happy with results she loves it!
Good luck with whatever u choose guy