with the xeccon light I have, the lighthead on the helmet is only ~60 grams or so and they have a nice quick mount adapter you can leave on your helmet when not out at night and it's very low profile and doesn't get in the way. Much lighter and less obtrusive than the $20 magicshine knockoffs and all the 5 million lumen 8xCREE led (!!) lights that you see everywhere. Some of my riding buddies have those and I've had one (two actually) in the past and anecdotally, the xeccon is more reliable. L&M Taz is also reliable and nice... but twice the price on sale, 4x the price full retail.