I use the light for daytime riding in flash mode. It is very bright and visible even in bright sunlight. The battery lasts for quite some time. I have done as many as 5 rides, 3 hour long, between charges. Even after those rides the indicators show that there was charge left. It is larger than my previous headlight, but it is better design over all. I have had very good luck with Portland Design Works products, and this one simply confirms my faith in the quality of the company.