I know this topic can become a heated one but which LED has been great in your experience. Been reading a lot lately on the LED Lenser and I see them widely available in Cape Union, etc but I have seen a lot of user comments that goes against LED Lenser in particular. This specific forum post below summed up four of the main technical issues- what has been your own experience with regard to your bike's light setup? " For one thing, Lenser lights are not regulated, in any way. They have no driver (computer chip to control current to LED, allow multiple modes), and instead rely upon a resistor, and the natural current resistance of alkaline cells to limit current to the LED. This is why they only allow the use of alkaline cells. The difference is pretty simple: a driver calculated the available voltages and currents, and determines whether or not to dim the light, thus showing you you have a dead battery, or continue to feed high current to the LED. A driven light usually has an output graph that is pretty flat, with a sharp drop off at the end, as the cells begin to be unable to provide the necessary power. A resistor-ed light, on the other hand, dims slowly over time, as the batteries begin to drain. They have a few minutes of initial brightness, then, as cell voltage drops, so does the available current, and the light dims over time. This is a bad thing, because it tells you your cells are dead, when they may only be partially depleted. Secondly, most, if not all Lenser lights are poorly heatsinked. This means that the LED has no way to transfer the heat it produces to the body of the flashlight, which severely shortens the life expectancy of the light. This is why most Lenser lights do not get warm to the touch (which is, unbelievably, a good thing, if a light gets warm rather quickly, it means that there is an effective path for heat to transfer from the LED to the body, to allow your hand to cool the light). Third, most (if not all, I'm not sure) Lenser lights are only anodized with Hard Anodizing, Level III (HA III). I believe they are only anodized to HA II. HA III is a much harder, more durable form of anodizing than HA II. In fact my dad has a Coast light he uses for work, where most of the anodizing has worn off in the last 2 years (and he barely ever has to use it, it stays in it's holster for the most part). Fourth, Lenser lights use very inefficient battery arrangements. A single AA battery has the same capacity (nominally) as three AAA batteries. The reason Lenser uses a three and four AAA cell configuration is to provide adequate voltage to the LED, without a driver, under current drain (alkaline voltage sag is horrendous above a moderate-to-low current drain). Take a look at some other brands, which are real quality, and much better bang for your buck, and prepare to be amazed"
