Here is a photo of the old light stick version 1:
Apparently, some fans were not happy with this design because it was too heavy, too big, and had sharp edges. Imagine accidentally hitting someone's head with one of those sharp corners because let's be honest -- it's difficult to cheer calmly when VIXX is on stage.
Here is the teaser image for the version #2 of the official light stick:
We can't see the entire design yet, but it seems like the newer version took many fans' concerns into consideration -- the sharp corners are no more!
The full release of the light sticks will be on November 10.