I live in a smallish city, so we don't exactly have streetlights everywhere. In fact, with the fall closing in and my unwillingness to admit that it's getting cold, i've been wearing my sweaters and jackets more often, which just so happen to be dark green and black and grey.No matter. This light is so bright that when i'm riding home after my late class, i never worry. I've only had the light for a few months now, so i can't attest to the longevity, but this is one tough little blinky. Last night i was commuting home from my 7pm class and i got caught in the rain. Pretty nasty stuff, actually. I got soaked. My glasses were fogged up. My light stayed on, didn't fill up with water, didn't short out and kept blinking so that even though i was wearing dark jeans and a black hoodie (with a grey backpack....maybe i need to change these things a little bit) i was still visible. This thing is so bright. I love it.