Forcing flowering does not cause reduced potency, and will not kill the plant. When you flip a plant from Veg to 12/12 it's being forced to flower.
It's actually very common to go straight from sprout/seedling into 12/12 with absolutely no bad issues. Google "12/12 from seed". People with very small grow spaces do this all the time with great results.

During Veg it's best to use 5000K or 6500K bulbs (blue). During flowering it's best to use the 2600K or 2700K bulbs (red). If you're using multiple bulbs it's good to add at least one bulb from the opposite end of the spectrum - for example in Veg maybe do 4- 6500K's and 1-2700K, and in flowering maybe 4-2700K's and 1-6500K. I'm just using those amounts as an example to point out that mixing both types is a good thing. You can use any number you'd like.
I hope this helps.

BTW, your plant looks pretty good! :thumbsup: