I’ve been carrying a Glock Tactical Light on my handgun for the last 2 years. Over this time, when I’ve had to engage a suspect or clear a building, I’ve been able to have my weak hand available for any other task, like issuing hand signals to other officers or opening a door. When your weak hand is holding a flashlight, regardless of its size, be aware that you may have to holster or sling the light in order to complete another task.
Whether it be a Glock, Surefire, or other make, consider purchasing a tactical light for your own safety. I also had to purchase a new Safariland holster designed to carry the two as one. The cost of purchasing the additional equipment is well worth the “Peace of Mind.”