Do you think our device can't keep up with the brightness other phones have when we use torch?
I made a MOD using this post.
I am not responsible if you break your LED, I can't assure you it won't cause any problem on the future, I can only tell you it gets hot if you use it for a long time!
1. Z2 on Lollipop/Marshmallow Firmware.
3. A root file explorer.
1. Download the file
2. Go to /system/etc and replace the file
3. Change permission to rw-r--r--
4. Reboot and enjoy!
Here is a video with instructions on how to install the mod from @freaky2xd