I think ol' Chris Costa used to run a dual light set up on his rig. Or at least did in one of the Magpul videos if I recall right. That said, I think that had to do with them running incandescent lights at the time and those bulbs weren't as durable as today's LEDs and as such could break and fail. At which point there a valid point to having two on the gun. With LED tech, and the fact that I have a few Surefire lights that have been through total hell and look it but still run just fine, I generally would feel a single quality light is enough. Now, two lights for two different tasks? Different situation and obvious mission drives the gear. I suppose one might argue for two lights on the rig because run time is not ideal, but I don't generally agree with that either.
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