I bought the Black Diamond Vectra IQ headlamp for use in my jump kit for amateur radio emergency service use. When we get called out it's usually after a bad storm, raining, dark and the power is out. I can use this lamp on high power while Im outside setting up an antenna, or switch on the LED for operating a radio in a dark room for hours at a time, or reading maps etc. With the battery pack in the back it creates a good balance on your head and you practically forget it's there. I also appreciate the blinking green LED locator on top because when I unzip my jump kit in the dark I can find my headlamp immediately. There is really nothing I don't love about this headlamp. I would buy it again in a heartbeat.