Well, being a recreational gynecologist, I employ a caver's headlamp when I go um, exploring. Ever since switching over from incandescent to an LED unit, the PT Aurora, my patients protest that they miss the warmth of the incandescent. I presume the "cold light" of the LEDs in fact irritates them, so I had to regress on the flashlight evolutionary scale, as it were. Associates in our profession who are ill equipped with a high-quality light are at high risk for tunnel vision, so my instinct was to advance to LED technology. Was I ever mistaken.