Dear all,
To those who meet with UI issues, please find the following suggestions from our engineers, and see if the problem still exists with your NiteCore D-I, then you just contact us, thanks!
As each of the light goes through double strict QC work, they should perform well normally.
So for operation issues maybe:
1. replace the battery;
2. twist the light bezel a few times back and forth;
3. the loosen-and-tighten or tighten-and-loosen operation should be done within 0.5second, if not fast enough, the mode switching failed.
If the light bezel is too tight, it may not be switched into the tactical mode, so twist it a few times to make better contact should work.
Also, if the light is 100% bright under user defined mode (loosened), then there might be confusion in the brightness changing, as it's not that obvious at first, so you may wait for 2-3seconds to see if the brightness changes.
Here we would like to link the vedio by WadeF, you may refer to it if interested.
http://www.youtube.com/watch?v=daFqQjRYgMs
If any issues may occur with your light, please do not hesitate to contact us, thanks!
P.S. ernsanada, as to the smoothness of the brightness changing, you may refer to the review by selfbuilt here,
https://www.candlepowerforums.com/threads/180378&page=2, there are graphs showing the rate of brightness changing. Also, please refer to your PM. thanks!
Best Regards,
Y.L.Wong