First of all, verify that your scripts don't include a brightness setting... if so remove it or raise it (max value 1.0).
If that's still not enough for you then have a look at the brightness method in unicornhat.py, it should be self-explanatory... however there is a reason we now reign the brightness back, use common sense, i.e don't look to the LEDs directly, use a diffuser, etc... eye injuries is not a matter to take lightly!