Two things are without question, One, you REALLY should have a light. Two, you can’t point a gun at ANYONE who isn’t an identified and immediate threat. For a civilian, this seems to contain an irrefutable point of unavoidable logic. which is, the light you use to IDENTIFY a threat, cannot be mounted on a gun!
There may well be a very important time and place for a light to be on the gun.
I liken it to the light on an AR or carbine. If , with your handheld flashlight, you should discover you are in immediate danger and need to employ your long gun, drop the flashlight and deploy the long gun, activating the light as you do so. ( because the long gun requires both hands ). You CAN however deploy your handgun with only one hand while bracing against the wrist holding the flashlight. Or perhaps you train to drop the handheld and activate a mounted light.
In either case, you can’t search, or conduct threat assessment with a light mounted on your gun.
Much of the training you may see on line is geared towards LE or military, we civilians have to observe more stringent rules of conduct when it comes to things like lights on guns.
The rule as I see it is, Weapon mounted light IN ADDITION TO, a handheld, NOT INSTEAD OF, for the above mentioned reasons.
By the time your weapon mounted light is pointed at someone, they ALREADY must be an immediate threat, otherwise you have done something wrong.
If I am wrong, and you can back it up with facts, PLEASE do so. I’ve gone over this several times, and this is the conclusion I have come too each time. Again, as a civilian, and not LE or military situations.
There seems to be a lot of confusion out there about this question, and the consequences of getting it wrong seem to be rather high in many cases.