16 hours of blue(ish) light, and upwards, is generally called a "veg room." . . . . . The idea, of course, is "not" to get flowers.

pure blue light (LED or actinic fluoro)
Blue led vs. Actinic fluoro is apples to oranges. Well, maybe kumquats to oranges. Compare the spectral graphs. LED = scalpel. Fluoro = shotgun.

And in this dirty world, nothing is "pure".

To the best of my knowledge, 12/12 red light signals the plant to flower whereas blue light does not trip flowering on or off.
Do you recall where you got this information? I'd double check it. 12 / 12 @ 6500K (some actinics are not so far from this) will induce flowering quite effectively; I've done it.

If you're got spare harvest to experiment, try it and let us know. But if you're growing needed medicine (lots of people on this site are, that's why I butted in here, sorry...) or for other reasons can't afford to mess up your grow, I'd research this a bit further before risking your success. Either way, good luck! :thumbsup:
DreadedHermie Reviewed by DreadedHermie on . Blue light after 'dark'? Has anyone here tried using pure blue light (LED or actinic fluoro) during the 'dark' or night phase when in 12/12 light cycle to keep photosynthesis going without interrrupting the flowering phase? I have one of the newer 50 watt blue LED panels and may give it a try, but would like to get some feedback first. Rating: 5