My cooling fans for my cob led makes to much noise. When I have guests can I turn off my leds and use a cfl bulb (6400k)? It's gonna receive same amount of light. My leds are full spectrum. So lower intensity, different spectrum but same time.
If the plants are still veging, the CFLs will prevent them from flowering if you are running them for the same time period as you would have run the LEDs. If the plants are on 12/12 flower and you substitute CFL for LED and maintain the same light time period, then the plants will continue to flower. If you are running autoflowers and you substitute CFL and continue to run the same time period, then the plants will continue to mature as autoflowers do.
6400k CFL is quite a bit to the blue side of the spectrum. Such a significant change in spectrum might stress the plants...maybe induce some herming, but I don't know for sure. If you have to make the substitution, it's not going to kill the plants. It will be less than desirable, but you've got to do what you've got to do.
If the plants are flowering, they will make a strong smell. You might not notice it so much since you're around it all the time, but visitors will notice the smell right away if you don't have very good odor control.
Good luck! Peace