Lumen question for experimental grow

This has probably been asked many times and i have seen a few different answers, but my stealth grow is somewhat odd and I'd greatly appriciate opinions on lumans/lighting for this. I am trying to grow a small, Sweet Cheese auto in the attached photo. According to the plant specs, they grow between 40~60cm and are fairly easy grows. I have experience growing bigger plants in a large grow area under HPS lighting, but this is an experiment to see if i can grow a small, trained plant to maturity with minimal resources. I have good ventilation and its on duct pipe so the surface is reflected all around. However, due to the small grow area I'm limited in lighting options. I have a 2800 lumen on this single plant in a pot no bigger than a coffee can. Will this be sufficent to get a few buds off my girl? Attached is a photo. The spray paint can is for reference of the grow area size. I will be either training it with chicken wire or tie downs and trimming to maximize my grow. As its set now, I have 50cm spacing from the top of the pot to the 2800lumen cfl. Again, this is more of an experiment and I'm not expecting a huge harvest so much as a successful one. Any comments or recommendations would be appriciated as this is my first small grow and first auto. Lastly, I'm currently running 18/6 and have been told to keep it the same on autos.

U may want more light... I did my Skywalker kush in a simillar arrangement and found that the sad amount of bud i gott off it was closer to shake... If u can get 8-10k lumens it would be better off... U will get some with what u r useing but it wont be worth the effort and cost

Is that a 6in. vent pipe? Who are you hiding this from?

8 inch vent pipe. And not really a hide so much as an experiment. Hobby of mine to build things out of nick nacks. I posted to get more of an idea of if it'll this work as is or not. I guess I shouldn't have mentioned "stealth" on the original post... "small enough to where its not a topic of conversation" would have been better?
Regardless, the current setup would be difficult to add more lighting, so based off the first response, this wouldn't be worth the effort. And thx daemon for the input.

i actually have a question about lumens also...i have t12 bulbs underneith my plants and hids above however i have 8 t12 bulbs, 2 are wide spectum,1900lumens and 2100 k, i have 3, 2900 lumen kitchen and bath bulbs that are 3100 k and 3 2900 lumen daylight bulbs that are 6400 k... i know the 2100 k is best for flower but their more expensive and less lumens, would i be better off just using the 3100 k bulbs because they have a higher lumen value??? and higher lumens = deeper penetration wright?? whats more important higher lumens or lower k value in flower??? anybody please help...

As for light input i would try a dome/cone top with lights mounted in it... U may b able to add 2 more to it...

Thechemist - am unsure which would be better but would think u would want higher penetration may turn out better