I purchased the Design Shine front/rear light combo (DS-500 Taillight and DS-1300 Headlight) for my Trek FX+ commuter and keep the battery stored in my seat pack. I run these both during the day and at night - most of my commuting is pre-dawn. I'm extremely satisfied with the quality/quantity of light that these two emit. I did consider the Dinotte package but decided to give this business a chance . . . I'm glad I did! He went out of his way to make sure that I was happy with the lighting and that all my questions/concerns were answered. I'm considering purchasing the DS-500 Taillight for my most-recent purchase, a 2011 Trek Madone 4.7 Compact. If you spend some time reviewing the different specs and videos, you'll see that this is a quality product meant to last for years ( http://www.designshinelighting.com/ ).