Using a 12,000k lamp last few days of flush

I'm growing in a 7x8 area with a 315watt cmh and a 400 watt enhanced hps. I've seen in store they make a 10,000k finisher bulb for cmh fixtures. However they want like a $100. I found a 12,000k 400watt aquarium bulb for $12. I decided to try that for 3-5 days. The recommended max time for cmh bulb was 7 days, so I just chose a couple less days with more uvb. Supposedly it is known to give up to a 30% increase in yield. It makes the plants use up all they have to secrete all the oils they can to protect from uvb rays. Thereby increasing weight and using up last of nutes for energy.

Was supposed to be Grapefruit Auto, but never flowered until I switched light time. They are also about 4 ft. tall and extremely bushy because I was told not to trim "autos".