Originally Posted by
rfomenko
Well, the original Cygolite Hotshot which I have has 30 lumen & is very visible during the day. I know because I have one. Its beam is too narrow so while it's great for the night, daytime is not hotshot's forte. It looks like the Serfas has that serrated lens for wide distribution & 5 more lumen brighter.
Why would you start a thread "asking" if it's ok for daytime then insist that it is?
Lumens is the total amount of light put out by the light. A light that's to narrow but otherwise bright enough for daytime riding would not be bright enough if the beam was made much wider.