Lumens don't mean that much with fluoro tubes because that lumen output is spread out over several feet. If you are going to go with fluoro tubes, you need to change up your growing method to take advantage of the lights. That means you will need to scrog, sog, LST or something else that will result in a more even canopy so that the light can reach the bud sites.
If you can get yourself some new seeds or new clones from a vegging plant. Since you've flowered your plant for 8 weeks already it's going to take forever for the new cuttings to root and start vegging again. You'll be ahead by atleast two weeks by just starting over with new plants.
as we all see int he pictures the buds arnt developed much at all in all my flowering clone experince i can tell you the amount of time to reveg has not as much to do with how long theyve been flowering but how devloped the buds are, iv taken bottem bottem branches off of a friends kens gdp he harvested and gotten them to root and be growing in veg in under 2 weeks. hes got a plant with tons and tons of viable clones theres enough potential clones there to teach yourself how to clone and 10 friends. shit id take half that plant as clones and do a soq as soon as there revegged and about 10 inches tall. not everybody has money to just go buy another tray of clones(or pack of seeds for that matter) everytime somthing dosent go right...
The only way you can say the hps is giving you 16000 lumens if it is hung from the top. Having it at the bottom is going to decrease your lumens drastically....I really dont know what to tell ya. Also...leaves gather light from the tops...and breathe in co2/exhale oxygen from the bottoms. Giving them light from the bottom up greatly reduces the amount of light they can use from your hps. The hooks I suggested will not pop out of the ceiling if you install them correctly. They are made for drywall. That 150hps...I used to have one...hung it from my ceiling just fine using them hooks. I installed safety lines from the hangers on the light to screws fastened into the shelf on my closet...that way, if for some reason it does fail, the light only falls a couple inches saving my plants. If you can't hang that hps from the top...I would suggest getting a tent and not growing anything else until you are able to hang your lights correctly. What you are doing is wasting time...money and effort. Sorry to be so bold but its the truth.
Big tall and ugly, you sure its 8 weeks? Its far too hot you need a peak memory thermometer to find out how hot, get the HPS off the ground not only is it heating the plants from the bottom up its basically doing nothing on the deck, put it overhead work something out. So the resaonn for this is too hot causing stretch and spindly look and lack of light causing spindly scrawny look.