The cygolite dash 320 headlight has a very good daytime visibility mode with a bright constant and/or flashing led’s. It’s light, easily movable from bike to bike and the lithium battery has reasonable hour times. Used it on a ride while going over a mist/very light rain summit a few weeks ago with no problems. Don’t know if they still make that model, mines a little over a year old and it's been good for day and night and it's been reliable. There should be reviews of it on the net too. There are ones with better material construction and more lumens but they are heavier and more costly too.