I have used one of his Borealis lights for about a year and a half. I am a midnight shift LEO. I use it everynight. It has never failed me. I am still using the same bulb that came with it.
I don't have the time to build my own, or I would have. A few people make these modified lights for those of us who can't or don't want to. I have no affiliation to Black Bear lights except as a VERY satisfied customer. I am quoted on his site because his light is terrific. I am Sgt D.A.
As a short example, I was on a call looking for a possible parole violator in a rural plant nursery. There were about 10 of us looking around. I was able to light up about 10 times the area of anyone else with my light. It was a nice feeling.
CPF member juancho is a great guy to deal with. I hope he is doing well with his light sales. I hope you check out his site and consider a purchase. Remember, I don't get anything for this glowing review, I'm just a very satisfied customer.
I would also suggest that if you think you can make your own mag mod, do it. I would have, but I had more money than brains and time.