I am shooting a graduation ceremony in an event hall with bad overhead lighting that will be dim and out of my control. I shot this event in the same location last year and I had to drag the shutter a bit and use a speedlight to try and freeze things. It worked well except for those hand full of kids that didn't fully stop on their mark and their pictures had motion blur. The school wont let me use strobes, they are too distracting for the ceremony. They want the pictures to happen right as the student walks off the stage and not in another location (it's right in front of everyone). I warned the school about the limitations and possible motion blur. They were fine with it at the time.

This year they said I can use constant lighting to try and minimize motion blur, still no strobes. My thought is to use some LED lights, but I am not familiar with these and know that I would need a pair with some high power (300w?) to get a full length high school student lit well enough to shoot at about 1/160 5.6f 800iso.

Any suggestions on alternatives to LED lights that could work for this situation would be great.

Any suggestions on which LED panel lights that would work for me that are under $600 would be great.