I dunno if this has already been covered, but I can think of two problems with 10/10.
The first being that your plant might not even flower. When we flower plants we essentially trick the plant into thinking that it is later on in the season. Of course there are no seasons in indoor, so there has to be a factor that tricks the plant! What is this factor? The amount of darkness. It's not just convenient that the amount of darkness has an even ratio with the amount of light, it's actually that most plants need 12 hours of dark to be "convinced" that a new season is coming and they need to start flowering. I don't know how much you know about evolution, but this is basically a survival tactic. The only time I would suggest fucking with the light cycle is if and only if you have a mutant plant.
The quality AND yield will go down. By rushing your plant you are depriving it of two of it's most important nutrients, sunlight and darkness. The way THC works is like a sunscreen for your buds. The sun will degrade the sunscreen during the day, and over the night, the plant will apply more of its sunscreen on the buds to protect them from the light. The less time that you allot for your plant to both apply its sunscreen and have its sunscreen degraded, the less amount it will put on. Simple as that, you will have less THC because of this rushed cycle.
Just a side note, most of the times when you rush something the results suffer, bud is no different. Sure, it's a weed, so it will survive, but taking away optimal growing conditions will never give optimal results... period.
Sorry to step on your nads like this... hey, maybe I'm wrong. Might as well try it to prove me wrong, but I wouldn't expect "super awesome" results. Good luck growing, post some pics!
Also, MuntantLizzard is completely right about lights. The only reason why you should even think about getting a new light is if your old one is trashed. Happy growing!