Let's say my friend has a plant.. 400w hps is what's in use but wondering if you could switch off each day or whatever time interval with a led panel. Not sure if it has been done but please bring your knowledge to this newby!!
I'm no light expert but I know during flowering you don't wanna stress your plants to much. I'm sure you'll get some answers from a light expert though
A lot of people on here have friends with problems I've noticed.
You could put the led at the top, then put a cool tube down in the middle of your plants so it radiates in all directions. That'd pump a bunch of lumens at them.
i'm with the majority in that it will probably cause stress. is there a particular reason you are interested in this? i'm guessing you'd like to save on the power bill but i don't think you would get enough benefit to justify it. i'd run both.